Put a match with a large needle with a seam, and wrap them tightly with the aluminum foil of cigarettes, and then bend the aluminum foil with a match at the end of the match. Then install the orientation tail in the place near the tail, and pull out the needle into a very simple backburur rocket. The experiments, put the small rocket on the wire, lit a match, and heated the part of the matches on the aluminum foil bag. When the temperature rises to the burning point of the match head, the matches in the foil are ignited, causing the surrounding air to swell sharply, and the gas is sprayed from the tail at a high speed. Due to the backbolic effect, the rocket launcher flew forward from the shelf. If the match where the two heads are packed in the aluminum foil, both ends are not closed at both ends. Put it on top and heat it from the middle. When the match in the tube was lit, the gas was sprayed from both ends, and the aluminum foil tube was still on the frame, which showed that the system's momentum conservation. The waste is: cigarette case, needle and match, etc. R n The clean eraser with a brush Material: large rubber, waste brush.
Tools: scissors, glue.
production method:
. Dig a shallow small round hole on the rubber end 2. Remove the pen's pen head and wash and dry it.
. Cut off the tip of the pipe to make it a small brush
. Embed the brush head into the small round hole of the rubber and stick it with glue
, good, clean the rubber. Whenever you rub the rubber, you can gently "scan" the debris on the paper with a brush, and then pour it into the waste basket.
This teach you to make invisible characters
Prepared: a fresh lemon, water, white paper, lamp or candle, small spoon, plate, cotton stick.
1. Cut the lemon and squeeze the lemon juice into the dish. 2. Add a few drops of water in the dish and stir with a small spoon to fully mix the water and lemon juice. . Use a cotton swab to apply lemon juice to white paper. . Dry the lemon juice on the white paper. 5. After the lemon juice on the paper is dry, put the paper on the lit candles (or the open light bulb). After a while, all the characters appear on the paper
The velvet doll has colorful velvet dolls beautiful and cute, because your clever and love gives them a beautiful image, they will also be your best friend. 1. Materials and tools: Various velvet wires, cotton or elastic flocs, silk petals, instant stickers, buttons, silk ribbons, double -sided glue, scissors. 2. Take the emperor's embarrassment. , Wrap a small group of cotton in it. . After confirming that the cotton is completely included in the velvet wire, tighten it with a ribbon in the lower part (with double -sided adhesive ribbon), the doll's head and body are divided. 5. Take a small section of velvet and tighten both ends. This is the hand of the doll. 6. Separate the body of the velvet doll from the middle and put it in the doll's hand. 7. After the body is closed again, tie the hand under the ribbon. 8. Eliminate a small braid with a velvet. Of course, what kind of hairstyle and color you like, she can look like. 9. Use the suspension in the middle of the baby's head to tie the braid. 10. Put the silk flower petals and a button through the suspension line in turn and cover it on the top of the baby, but she is her hat. 11. Cut your eyes and mouth with instant stickers and stick to the baby's face. 12. This is the good velvet doll. They can hang on your bed or table lamp and schoolbag every day.
The test how much rain is now.
is raining again. Looking at the rain scene outside the window, do you suddenly want to know how many rainwater falls on farmland and Xiaohe ,on the street? Usually, when listening to the weather forecast, I often hear: "According to a meteorological station, how many millimeters of rainfall today ... So, what is rainfall? How does rainfall measure? The rainwater landing on the ground, without evaporation, penetration, loss, and the depth of the water layer accumulated on the horizontal plane. We call the rainfall (in the units of millimeters), which can intuitively represent how much rainfall. At present, the meteorological station (station (station (station (station (station (station ) The commonly used instruments that measure the rainfall are the rainfall and the cup. The diameter of the rainfall tube is generally 20 cm, and the interior is a funnel and a bottle. The diameter of the measuring cup is 4 cm. You can know the rainfall of the day. If you do n’t have a rain tube at hand, you do n’t have to worry. You can use some common utensils, you can make one yourself, and the effect is quite good. Take a diameter of 20 cm of 20 cm. Porcelain bowl, drill a small hole slightly larger than corn kernels at the bottom of its bottom, and then place the porcelain bowl on a jar (a glass bottle, the bottle mouth is connected with the small hole in the bottom of the bowl). The simple rainfall tube is done. After the simple rainfall tube is done, it can be placed at a height of 70 cm from the ground to undertake the rainwater. After the rain stops, the weight of the water in the bottle is called. 1 millimeter of rainfall. The rainwater from the sky is an important source of water on the land. If it is not polluted, its water quality can be almost comparable to distilled water. After the collected rainwater is treated a little, it can be used to pour green space, clean the vehicles, and wash away the road. Do you also have your own tips for how to make full use of "sky falling water"? The speaker of the flames of the flame In a canned cans, cut off the one end of the can, and open a small hole at about 2cm from the bottom of the can. Another piece of hard paper (or horse dung paper) is rolled into it to roll it into it into it into The horn -shaped, stuffed the blowing mouth of the horn into the small hole of the canas, the connection point is firmly fixed with hundreds of glue, and the air cannot be leaked, because this is related to the success or failure of the experiment (the small holes in the cana are scrapeed with a knife a few times with a knife a few times a few times. ，使其表面粗糙，容易胶牢）。u003CBR>u003CBR> 实验（一）：点燃蜡烛，将火焰靠近喇叭口，把易拉罐快速按进盛有水的容器中，可看到蜡烛的火焰向外偏，好像火焰从喇叭里吐出来似的（图一）。u003CBR>u003CBR> 实验（二）：将易拉罐慢慢按入水中至一定深度后，迅速将易拉罐向上提拉，会看到The speaker swallow the flame of the candle in the tenon Eri 2)? BR> u003Cbr> The physical principle is: a certain amount of gas, under the condition of unchanged temperature, its pressure is inversely proportional. The inner gas is compressed and the pressure increases. When the pressure is greater than the external air pressure, the gas in the tank will be blown out of the horn, and the flame is deflected outward; otherwise, the internal gas pressure is less than the air pressure, and the candle flame is swallowed into the horn.
Seven -star ladybug
Rotation of raw materials: the ball -shaped medicine box for Chinese medicine; red and black watercolor Big pen or pigment can be available; big head needle. 1. Wash the pill box, remove the medicine, dry it, take half of it; . Use the red watercolor pen or red pigment and paint to put half a pill box; 3. Put half of the color boxes under the fan and blow dry. Use the black watercolor or black pigment to draw the point on the red background, and draw a semi -circular shape on the edge of one place as the head (the specific drawing method is shown in the figure). From this semi -circular point, in the middle of the pill box, Draw a slightly thicker black line; . Put 2 large head needles on both sides of the head as the head of the ladybug. In this way, a cute seven -star ladybug is ready.
The double cone can be rolled up
1. Material: Cut into a round thick paper (it is advisable to be within 15 cm in diameter), scissors, glue, a pair of chopsticks, a pair of chopsticks Or two long sticks, a big book, a small book. 2. Cut the round thick paper half of the paper, roll the round heart as the apex into two cone, and stick it with glue. 3. Paste the bottom of the two cone to become a double cone. . Put a large book from a small book and a small book on the table to the table, and put two chopsticks or thin sticks on the book, so that the lower one side is slightly left. At this time, you put the double cone on the end of the chopsticks near the small book, and you will be surprised to find that it will roll up the rail uphill! The principle is: The center of gravity of the double cone on both ends and the intersection of the middle center, because the chopsticks are open, if you carefully observe the two ends of the double cone, they are actually in fact It is rolled downwards. On the surface, the end point of the double cone is higher than the point, but its focus is always going down. Remember, unless there is an external effect, gravity will always move the object to the ground, but don't be confused.
The balance of air making materials: paper, glue, candle, thin line. production steps: 1 1. First cut 24 cm long and 15 cm wide note, each picture is divided into five parts in the diagram. point. 2. Fold the note into a square bucket shape according to the segmentation, and the narrow part of 2 cm wide as the bonding strip. . Press the middle end of the upper part of the square bucket into the middle end of the square, bond, and then stick a 20 cm long thread in the middle. This is the titled bag of balance. 5. A 25 cm long note is rolled into a fine stick. This is the titles of the balance. 6. Tie the two pocket mouths down on both sides of the scale. 7. Put the burning candles under a bag (beware of the bag to burn the bag), saying that the bag immediately begins to rise. The other said that the bag began to decline. This shows that the warm air is lighter than the cold air! why? Because the hot air is less relative to the cold air, its relative density is small, so it is lighter than the cold air, and the hot air balloon is made based on this principle.
The "Pig"
The spare time, it is interesting to make a "running little pig" by yourself. material L: hard cardboard, yellow mud, rubber band, wire rope, color, paste, scissors. Methods: ① Figure 1, draw the graphic on the hard paper plate, cut it down, punch holes at the "0", and fold at the dotted line. ② Use yellow mud (preferably rubber puree) to make a "mud wheel". ③ Insert a single -stock rubber band in the left and right holes of the "Mud Wheel", and fix the rubber tendon on both sides. ④ Fix a wire rope on the "mud wheel", put the wire rope around the middle of the wheels, and put the line head out of the hole in the middle. In play, first lift the wire rope from the top. At this time, the weight of the pig will rotate the wheel backwards, while the rubber band on both sides of the "mud" will be tightened. Put the pigs on the table and put down the line rope. With the power of the rubber band, the small wheel will rotate forward, and the "pig" runs forward automatically.
The automatic rotating paper
Themid -shaped thin paper slices (3 cm long, 1 cm wide), a long sewing needle. The pairs of pairs of paper according to its straight two middle lines. Open the paper and put the intersection of the two creases on the vertical needle tip (insert the needle first on the cork and fix it, and the needle tip faces it), so that the needle tip is just under this point, and the paper sheet is balanced Essence Rub both palms of your hands to improve the temperature of the palm of your hand, and then slowly put your palms next to the paper (as shown in the figure below). Note that your hands should be moved gently. Do not let the wind blow off the wind when the hand moves. At this time, it can be seen that the paper rotates. At first, it was slower and faster. If the hand is quietly taken away, the paper sheet stops immediately; move the hand close, and rotate the paper again. What mysterious power rotates the paper? turns out that the temperature of the finger end is lower than the palm of the palm because the temperature of the people's hands is different; therefore, the place near the palm will cause a strong rise in airflow. , This force can rotate the paper.
This chopped chicks
In sporadic horn of the sponge, according to its shape, combined with the appearance of animals, start the brain tendon, use cut, paste, and dye Methods, you can create a small and exquisite small animal work. Let ’s make small chicks as an example: . Make materials one sponge, watercolor pigment, two beads, hundreds of glue. . Production method 1. Cut the sponge to grow up, and on the cuboid, draw the chick's body, head, and foot (the feet can be larger), and the mouth of the mouth. (Figure 1). 2. See the drawing of the drawing (there is a certain amount of room), and boldly cut out its side shape (Figure 2). 3. In the front and rear directions of the chicken, the head, body, and foot shape of the trimmed, and cut the chicken wings (not too deep). When trimming, pay attention to keeping the chicken straight (Figure 3) 4. Starting from the overall form, carefully cut the local area to remove the large scissors. 5. According to your own love, you can dye or color. After drying, paste the decorative beads as the eyes (Figure 4). If there are several sponges of different shapes, you can design several chicks with different postures according to the above method. A group of lively and lovely chicken will make you love
Mazting paper bridge
. Experimental materials: two cups, some card paper, one heavy object (such as soap), cutting knife, solid glue. . Open the two cups on both sides and place a card paper on it. This is a simple paper bridge. 3. Try it, see how much it can withstand? As a result, it collapsed as soon as the heavy object was put. 4. This paper is folded into a corrugated shape with 1 cm as a partition, and the new bridge is completed. 5. Come back the paper bridge and see, this time the heavy objects put them up steadily. 6. Cover the card paper into many thin strips and roll it into cylindrical bodies. 7. Sticking these cylinders side by side, what you see is another bridge. 8. Such a paper bridge is also very strong and has a lot of load -bearing capabilities.
The experimental principle: a piece of flat paper is very thin, and small force thickness leads to small tolerance. After folding the paper into a corrugated or rolled into a cylindrical body, the thickness of the force is greatly increased, and the tolerance is much greater. In the stress structure such as bridges and architecture, such a structure is often used, lightweight and solid, and saves many materials than solid structures. Think about it, what other structure can achieve this effect?
egg jet boat
. Experimental materials: eggs, cardboard, coarse wire, candle head, straw, double -sided glue, scissors, pliers. . A 15 -centimeter -long and 15 -cm width -wide cardboard, drawing a folding line in a picture, it will be made into a hull. 3. Press the folding line to fold the hull. 4. Stick double -sided adhesive on the two ends of the boat, fold inward, and stick well. 5. Cut a rudder . Cut a vertical seam in the middle of the stern, plug in the rudder, and wear two thick iron wires in the middle of the ship. The interval is 3 cm. The middle part of the iron wire is slightly curved. 7. Turn a small hole on one end of the egg, and the other side is tied side by side with two small holes, blowing from an entrance to the egg to the eggs, so that the contents of the eggs flow out of the other end. 8. Cut the straw into two 4 cm long (jet pipes), insert it in two holes in one end of the egg, a depth of about 1 cm, and then seal it with wax. 9. After the other end of the egg (note that the water level should be below the jet pipe), seal the mouth with double -sided glue. This is a small boiler. 10. Make a stove now! Put the candle head on the bottom of the ship (in the middle of 2 iron wires) and lit. A bottle cap can be matched under the candle. 11. Put the egg boiler on the thick iron wire, and the jet pipe levels are backwards. After a while, the water boiled, a steam sprayed out of the jet tube, and the boat was advancing in the water! If its rudder deflection has a certain angle, the boat will circulate in the water.
The experimental principle: The steam that is continuously generated after the water can only be discharged from the jet pipe, so there is a backward effect, and this force has a forward force on the boat. So the boat drove forward. This is in line with Newton's third law. Each force has an equal reaction force.
The ping pong dolls 1. Let's make a cute doll again. She is also made of those small items around us. It's your favorite. Materials and tools: bath balls, various colors of cardboard, table tennis, velvet threads, velvet balls, pills, small items that can be used as eyes, double -sided glue, scissors. 2. Cut a hole with a diameter of 1.5 cm in the middle of the table tennis. . Cut a piece of upper end of 5.5 cm in width, 10 cm width at the lower end, and 11 cm long trapezoids. Paste double -sided glue on one beam to form a pillar body. Finally, the pillar body is formed. Finally Cut the upper and lower end with scissors, which is the doll's body. 4. Cut a small nylon net on the bath ball, wrap it on the pillar body, and stick it with double -sided glue. 5. Insert the upper end of the pillar into the cave on the table tennis, the doll's head is connected with the body. 6. Cut a piece of 10 cm long velvet, adhere to the back of the body with both sides, and then bend to make a doll hand. 7. Eliminate a small braid with a velvet. 8. Use double -sided glue to stick the braids on the head of ping -pong dolls, stick two velvet balls on the bottom of the pillar, and stick your eyes and mouth on the tabletop face. 9. Cut a card paper that is equivalent to table tennis, and use double -sided to glue on the head of ping -pong dolls as a hat, and flatten the upper end with your fingers. 10. Stick one and a double -sided glue in the middle and tops of the hat, and stick the colorful velvet balls one by one as a hat accessories. Sticking to the neck. You see, ping -pong dolls are laughing at you.
Necholon small pendants A many New Year, students have received a lot of New Year's money. Have you ever thought about the New Year's bag that put on New Year's money and can become a beautiful and festive small pendant? Intersection 1. Materials and tools: 12 New Year bags, 1 China knot, one silk (thin rope), tape paper, double -sided glue. 2. Fold each New Year's bag first, and then fold the four corners to the creases in the middle. 3. Paste the double -sided glue at the bottom of each angle. 4. Circle silk threads and knots. One end of the tape paper passes through the wire thread, sticks to the wire thread, and the other end sticks to the inner side of the New Year's bag (tightly creased). In this way, the hanging wire wire is fixed. Be careful not to expose the tape. 5. The four New Year bags with silk threads are sticking to the corner of the folding angle. This is the top of the pendant. 6. Take another folding New Year's bag, sticking China to the inside like a sticky hanging wire. Then stick the four New Year bags, including it, and stick the corner to the corner. This is the bottom of the pendant. 7. There are 8 folding angles on the top and bottom of the pendant, so the remaining four New Year bags are also touched in the middle of them. 8. After the bottom and the top are connected through the four New Year bags, the pendant is completed. Is it good? rnrn 会吼叫的小盒子rnrn 一、实验材料：一个纸（木或铁）盒、一支铅笔、一段绳子、一块松香、彩笔、胶水、 White paper. . Tie the rope to the middle of the pencil. . Wipe the rope with a rosin, just like the bow string of the instrument, make it astringent. rn 四、在盒子的一边开一鲂】祝���哟┕�】祝�Ρ柿粼诤凶拥睦锩妗?BR> 五、在盒子外面包上白纸，用胶水粘好Essence 6. Draw a lion on the box or other guys with a big voice. The tail should just be aligned with the exit of the rope. Seven. Hold the box with one hand, and to push the rope with the index finger and thumb of the other hand, yeah, you hear the roar of the lion ... Experimental principle: The friction sound of the rope passed to it to the rope to the sound of the rope to the sound of the rope to the pass to the sound of the rope to the sound of the rope. After the box, the walls are vibrated and sounded. In this experiment with different shapes and different materials, the sounds will be different, and sometimes the sounds can be shocking. The sound of string instruments is to use this principle, such as violin, cello, etc.
Makone zither 1. Materials and tools: one empty wooden box or hard paper box, triple board or a strong hard cardboard, several coat bands, and scissors. 2. Cut the three -in -board or hard cardboard into a right triangle, and cut a small gap every 1 to 2 cm every 1 to 2 cm. 3. Stick the cut straight corner triangle in the middle of the empty wooden box, pull the rubber band long in the box and beveled gap. 4. Dipping the rubber band, try, can you play 1-2-3-4-5-6-7 ... You can adjust the scales of the rubber band tightly.
Ilisaine pendants The new semester began, and the students gathered happily. During the spare time, try to make a few small pendants, leave it to yourself, or give it to teachers and classmates, and entrust a sincere wish. 1. Materials and tools: Golden paper (can also be replaced by other colored paper), Chinese knot, KT blowstab (also use color cardboard instead), fine wood strips, fine lines, double -sided glue, paper cutter knife knife knives ,Scissors.
Axibly pistol The students, if you can have a submarine mirror, you can clearly see things in the distance, such as being blocked by a tall man. The situation on the sea is the same. Very interesting, let's do one now. 1. Preparation of production materials: thick card paper, small mirror of 10 × 7.5 cm on both sides, scissors, double -sided glue, triangle, knife, pencil. . The thick card red is cut into 31 × 40 cm size. The line is drawn on the card paper according to the figure. The four parallel lines are 7.5 cm separately. The square in the lower right corner is also the same size, and a 4 -centimeter diameter circle is drawn in the middle. 3. Cut the "×" square and the circular shape in the lower right corner, fold the four parallel lines inward, and apply double -sided glue on the narrow side of 1 cm on the side. The long pillar, the square and circles just cut into two small windows in the opposite direction. 4. Take out the glass in the small mirror and put double -sided glue on the four sides. 5. Two pieces of glass and no windows shall be used to stick the angle of 45 degrees in the long column. Note that the position of the two pieces of glass after sticking should be parallel. Note that the window and the inside of the column should not be blocked. 6. The cutting square is glued to the top of the long pillar with double sides, and the small subtitralsted mirror is done. You can use it to see a lot of unexpected things. The experimental principle, because the light is reflected twice by the mirror, and is transmitted in the mirror body (long pillar), how long your subtastic telescope body does, how long your sight can extend.
The writing with "invisible" ink In adventure novels, you can often read the secret letter or treasure map written by "invisible" ink ... To unveil. Today we will learn how to write this kind of secret letter ... 1. Ordinary white paper, pen, lemon. 2. Cut a lemon into half, this is your "invisible" ink. 3. Press the pen into the lemon flesh to make the pen tip invade lemon juice. But don't be too much, otherwise it will drop. 4. Use this special ink to write your "secret letter" on the paper. Use some force when writing to make the stroke thicker. The word written with a thick pen tip is the best. 5. Lemon juice is dry quickly, and the words you write are nothing. 6. Slowly bake the paper with a lighter. Be careful not to burn the paper, otherwise you will never be gone! During the heating process, the invisible handwriting gradually becomes brown characters, and this letter can be read!
In small phone
1. Experimental materials and tools: paper cup (or empty tank box) 2, one section of long rope, color paper, scissors, double -sided glue, can be taken as a time Small balls of eyes. 2. The two microphones of the small phone are cute cartoon partners. Let's let them live. First cut the "parts" of a little frog with green paper -forelimbs, hind legs, eyes, etc. 3. Stick these parts into a paper cup to make it a little frog. 4. You can also use this method to make a puppy or other small animals you like and paste it on another paper cup. 5. In the center of the cup of two paper cups (now it has become a cartoon tube), a small hole is made in the center of the center. 6. Put a long rope (length above 10 meters) into the small holes at the bottom of the cup, and then knots. 7. After the small phone is made, put one microphone of the small phone in the ear, and then ask your friends to hold another microphone and stand 10 meters away from you (if the length of the rope is 10 at 10 If you are above the rice, you have to stand farther away from you. That is: the length of the rope is the distance between the two), singing or speaking in the microphone. The rope should be tightened and cannot be exposed to other things. 8. Although you and your friends are 10 meters away, you can clearly hear his voice. Experimental principles: Your friend singing and speaking sound will vibrate the bottom of the paper cup (microphone), vibrates along the rope to the paper cups in your ear, and causes vibration. Can clearly hear your friend's voice. (This is much clearer than the same distance between you and the same volume, because the effect of the sound spread in the solid is better than spreading in the air.)
obedient and disobedient eggs
. Experimental materials: several eggs, some sand, candles, signs or watercolor pens, color paper. . Take two eggs, pierce a hole on the small end, pour the egg and green egg yolk inside and dry the empty egg shell. . In the empty eggshell, it is installed with sand with a total volume of about 1/4 to 1/3, respectively. . Take out one of the eggshells installed with sand, and you will be surprised by the obedience of this egg. What posture do you keep this egg in what posture you keep? You can also keep it balanced on various slope, but the surface should not be too slippery. If you seal the above mouth, it can still stand down with a small head. But in order to keep it holding your posture, you better knock it a few times and let the sand inside be in a horizontal state. 5. Pick up another egg shell installed with sand, let it stand upright and tap a few times to let the sand be in a horizontal state, and lit the candle to let the wax oil drip on the sand to fix the sand. 6. This is made into an obedient egg. No matter what posture you put it, it always goes back to its original posture. If you use color paper to make a small hat for it, and then draw a cute face, it will become an interesting tumbler. Experimental principles: The original focus of the egg is in the middle, and it is difficult for you to "obedient" or "disobedience". After installing the sand, the center of gravity of the egg is on the sand. Before the sand was not fixed, as the egg posture changed, the center of gravity of the sand was the lower part of the egg in the posture. And when the sand is fixed to the lower part of the egg, it also makes it a tumbler due to the principle of gravity.
The snake -shaped windmills on the candle . The production material: large head needle, empty rubber roll box, candle, fine plastic straw, pencil, cardboard, scissors. . Draw a spiral line on the card paper, and draw the head shape of a snake at the end. . According to the figure, cut it along the line, and a small hole must be poked in the middle. You can just pass through a fine plastic straw. This is a snake -shaped windmill. . Began to be a tripod now. First insert a large needle on the rubber head of the pencil, then cut a small cut plastic straw and sealed one end, and put it on a large head needle to become a hats. . Open a round hole on the top of the glue roller and insert a pencil vertically. 6. The small holes in the middle of the snake -shaped windmill pass through the hood, and the windmill is completed. Seven, lit the candle below the windmill, you will see that this snake starts to rotate. If the windmill is placed on the top of the stove or heate, there is the same effect. Why does this phenomenon appear? Because the warm air is lighter than the cold air, rising warm air can promote the rotation of the windmill. In daily life, in the room, the rising warm air has been rising, flowing along the sky flower board to the window, being cooled by the window and falling to the floor. The warm air of heating) rises, which can increase the gliding machine. The answer is you satisfied?
Frost is the flower of the seasons in autumn, it is the fat of light in autumn, and it is the fire of red thoughts in autumn. Imagine what will happen to the autumn without frost, and can the chrysanthemum that blooms in the late autumn still proud?
Put a match with a large needle with a seam, and wrap them tightly with the aluminum foil of cigarettes, and then bend the aluminum foil with a match at the end of the match. Then install the orientation tail in the place near the tail, and pull out the needle into a very simple backburur rocket.
The experiments, put the small rocket on the wire, lit a match, and heated the part of the matches on the aluminum foil bag. When the temperature rises to the burning point of the match head, the matches in the foil are ignited, causing the surrounding air to swell sharply, and the gas is sprayed from the tail at a high speed. Due to the backbolic effect, the rocket launcher flew forward from the shelf.
If the match where the two heads are packed in the aluminum foil, both ends are not closed at both ends. Put it on top and heat it from the middle. When the match in the tube was lit, the gas was sprayed from both ends, and the aluminum foil tube was still on the frame, which showed that the system's momentum conservation.
The waste is: cigarette case, needle and match, etc. R n The clean eraser with a brush
Material: large rubber, waste brush.
Tools: scissors, glue.
production method:
. Dig a shallow small round hole on the rubber end 2. Remove the pen's pen head and wash and dry it.
. Cut off the tip of the pipe to make it a small brush
. Embed the brush head into the small round hole of the rubber and stick it with glue
, good, clean the rubber. Whenever you rub the rubber, you can gently "scan" the debris on the paper with a brush, and then pour it into the waste basket.
This teach you to make invisible characters
Prepared: a fresh lemon, water, white paper, lamp or candle, small spoon, plate, cotton stick.
1. Cut the lemon and squeeze the lemon juice into the dish.
2. Add a few drops of water in the dish and stir with a small spoon to fully mix the water and lemon juice.
. Use a cotton swab to apply lemon juice to white paper.
. Dry the lemon juice on the white paper.
5. After the lemon juice on the paper is dry, put the paper on the lit candles (or the open light bulb). After a while, all the characters appear on the paper
The velvet doll
has colorful velvet dolls beautiful and cute, because your clever and love gives them a beautiful image, they will also be your best friend.
1. Materials and tools: Various velvet wires, cotton or elastic flocs, silk petals, instant stickers, buttons, silk ribbons, double -sided glue, scissors.
2. Take the emperor's embarrassment. , Wrap a small group of cotton in it.
. After confirming that the cotton is completely included in the velvet wire, tighten it with a ribbon in the lower part (with double -sided adhesive ribbon), the doll's head and body are divided.
5. Take a small section of velvet and tighten both ends. This is the hand of the doll.
6. Separate the body of the velvet doll from the middle and put it in the doll's hand.
7. After the body is closed again, tie the hand under the ribbon.
8. Eliminate a small braid with a velvet. Of course, what kind of hairstyle and color you like, she can look like.
9. Use the suspension in the middle of the baby's head to tie the braid.
10. Put the silk flower petals and a button through the suspension line in turn and cover it on the top of the baby, but she is her hat.
11. Cut your eyes and mouth with instant stickers and stick to the baby's face.
12. This is the good velvet doll. They can hang on your bed or table lamp and schoolbag every day.
The test how much rain is now.
is raining again. Looking at the rain scene outside the window, do you suddenly want to know how many rainwater falls on farmland and Xiaohe ,on the street? Usually, when listening to the weather forecast, I often hear: "According to a meteorological station, how many millimeters of rainfall today ... So, what is rainfall? How does rainfall measure? The rainwater landing on the ground, without evaporation, penetration, loss, and the depth of the water layer accumulated on the horizontal plane. We call the rainfall (in the units of millimeters), which can intuitively represent how much rainfall. At present, the meteorological station (station (station (station (station (station (station ) The commonly used instruments that measure the rainfall are the rainfall and the cup. The diameter of the rainfall tube is generally 20 cm, and the interior is a funnel and a bottle. The diameter of the measuring cup is 4 cm. You can know the rainfall of the day.
If you do n’t have a rain tube at hand, you do n’t have to worry. You can use some common utensils, you can make one yourself, and the effect is quite good. Take a diameter of 20 cm of 20 cm. Porcelain bowl, drill a small hole slightly larger than corn kernels at the bottom of its bottom, and then place the porcelain bowl on a jar (a glass bottle, the bottle mouth is connected with the small hole in the bottom of the bowl). The simple rainfall tube is done. After the simple rainfall tube is done, it can be placed at a height of 70 cm from the ground to undertake the rainwater. After the rain stops, the weight of the water in the bottle is called. 1 millimeter of rainfall.
The rainwater from the sky is an important source of water on the land. If it is not polluted, its water quality can be almost comparable to distilled water. After the collected rainwater is treated a little, it can be used to pour green space, clean the vehicles, and wash away the road. Do you also have your own tips for how to make full use of "sky falling water"? The speaker of the flames of the flame
In a canned cans, cut off the one end of the can, and open a small hole at about 2cm from the bottom of the can. Another piece of hard paper (or horse dung paper) is rolled into it to roll it into it into it into The horn -shaped, stuffed the blowing mouth of the horn into the small hole of the canas, the connection point is firmly fixed with hundreds of glue, and the air cannot be leaked, because this is related to the success or failure of the experiment (the small holes in the cana are scrapeed with a knife a few times with a knife a few times a few times. ，使其表面粗糙，容易胶牢）。u003CBR>u003CBR> 实验（一）：点燃蜡烛，将火焰靠近喇叭口，把易拉罐快速按进盛有水的容器中，可看到蜡烛的火焰向外偏，好像火焰从喇叭里吐出来似的（图一）。u003CBR>u003CBR> 实验（二）：将易拉罐慢慢按入水中至一定深度后，迅速将易拉罐向上提拉，会看到The speaker swallow the flame of the candle in the tenon Eri 2)? BR> u003Cbr> The physical principle is: a certain amount of gas, under the condition of unchanged temperature, its pressure is inversely proportional. The inner gas is compressed and the pressure increases. When the pressure is greater than the external air pressure, the gas in the tank will be blown out of the horn, and the flame is deflected outward; otherwise, the internal gas pressure is less than the air pressure, and the candle flame is swallowed into the horn.
Seven -star ladybug
Rotation of raw materials: the ball -shaped medicine box for Chinese medicine; red and black watercolor Big pen or pigment can be available; big head needle.
1. Wash the pill box, remove the medicine, dry it, take half of it;
. Use the red watercolor pen or red pigment and paint to put half a pill box;
3. Put half of the color boxes under the fan and blow dry. Use the black watercolor or black pigment to draw the point on the red background, and draw a semi -circular shape on the edge of one place as the head (the specific drawing method is shown in the figure). From this semi -circular point, in the middle of the pill box, Draw a slightly thicker black line;
. Put 2 large head needles on both sides of the head as the head of the ladybug. In this way, a cute seven -star ladybug is ready.
The double cone can be rolled up
1. Material: Cut into a round thick paper (it is advisable to be within 15 cm in diameter), scissors, glue, a pair of chopsticks, a pair of chopsticks Or two long sticks, a big book, a small book.
2. Cut the round thick paper half of the paper, roll the round heart as the apex into two cone, and stick it with glue.
3. Paste the bottom of the two cone to become a double cone.
. Put a large book from a small book and a small book on the table to the table, and put two chopsticks or thin sticks on the book, so that the lower one side is slightly left. At this time, you put the double cone on the end of the chopsticks near the small book, and you will be surprised to find that it will roll up the rail uphill!
The principle is:
The center of gravity of the double cone on both ends and the intersection of the middle center, because the chopsticks are open, if you carefully observe the two ends of the double cone, they are actually in fact It is rolled downwards. On the surface, the end point of the double cone is higher than the point, but its focus is always going down. Remember, unless there is an external effect, gravity will always move the object to the ground, but don't be confused.
The balance of air
making materials: paper, glue, candle, thin line.
production steps:
1 1. First cut 24 cm long and 15 cm wide note, each picture is divided into five parts in the diagram. point.
2. Fold the note into a square bucket shape according to the segmentation, and the narrow part of 2 cm wide as the bonding strip.
. Press the middle end of the upper part of the square bucket into the middle end of the square, bond, and then stick a 20 cm long thread in the middle. This is the titled bag of balance.
5. A 25 cm long note is rolled into a fine stick. This is the titles of the balance.
6. Tie the two pocket mouths down on both sides of the scale.
7. Put the burning candles under a bag (beware of the bag to burn the bag), saying that the bag immediately begins to rise. The other said that the bag began to decline. This shows that the warm air is lighter than the cold air! why? Because the hot air is less relative to the cold air, its relative density is small, so it is lighter than the cold air, and the hot air balloon is made based on this principle.
The "Pig"
The spare time, it is interesting to make a "running little pig" by yourself.
material L: hard cardboard, yellow mud, rubber band, wire rope, color, paste, scissors.
Methods: ① Figure 1, draw the graphic on the hard paper plate, cut it down, punch holes at the "0", and fold at the dotted line.
② Use yellow mud (preferably rubber puree) to make a "mud wheel".
③ Insert a single -stock rubber band in the left and right holes of the "Mud Wheel", and fix the rubber tendon on both sides.
④ Fix a wire rope on the "mud wheel", put the wire rope around the middle of the wheels, and put the line head out of the hole in the middle.
In play, first lift the wire rope from the top. At this time, the weight of the pig will rotate the wheel backwards, while the rubber band on both sides of the "mud" will be tightened. Put the pigs on the table and put down the line rope. With the power of the rubber band, the small wheel will rotate forward, and the "pig" runs forward automatically.
The automatic rotating paper
Themid -shaped thin paper slices (3 cm long, 1 cm wide), a long sewing needle.
The pairs of pairs of paper according to its straight two middle lines. Open the paper and put the intersection of the two creases on the vertical needle tip (insert the needle first on the cork and fix it, and the needle tip faces it), so that the needle tip is just under this point, and the paper sheet is balanced Essence Rub both palms of your hands to improve the temperature of the palm of your hand, and then slowly put your palms next to the paper (as shown in the figure below).
Note that your hands should be moved gently. Do not let the wind blow off the wind when the hand moves. At this time, it can be seen that the paper rotates. At first, it was slower and faster. If the hand is quietly taken away, the paper sheet stops immediately; move the hand close, and rotate the paper again.
What mysterious power rotates the paper?
turns out that the temperature of the finger end is lower than the palm of the palm because the temperature of the people's hands is different; therefore, the place near the palm will cause a strong rise in airflow. , This force can rotate the paper.
This chopped chicks
In sporadic horn of the sponge, according to its shape, combined with the appearance of animals, start the brain tendon, use cut, paste, and dye Methods, you can create a small and exquisite small animal work. Let ’s make small chicks as an example:
. Make materials
one sponge, watercolor pigment, two beads, hundreds of glue.
. Production method
1. Cut the sponge to grow up, and on the cuboid, draw the chick's body, head, and foot (the feet can be larger), and the mouth of the mouth. (Figure 1).
2. See the drawing of the drawing (there is a certain amount of room), and boldly cut out its side shape (Figure 2).
3. In the front and rear directions of the chicken, the head, body, and foot shape of the trimmed, and cut the chicken wings (not too deep). When trimming, pay attention to keeping the chicken straight (Figure 3)
4. Starting from the overall form, carefully cut the local area to remove the large scissors.
5. According to your own love, you can dye or color. After drying, paste the decorative beads as the eyes (Figure 4). If there are several sponges of different shapes, you can design several chicks with different postures according to the above method. A group of lively and lovely chicken will make you love
Mazting paper bridge
. Experimental materials: two cups, some card paper, one heavy object (such as soap), cutting knife, solid glue.
. Open the two cups on both sides and place a card paper on it. This is a simple paper bridge.
3. Try it, see how much it can withstand? As a result, it collapsed as soon as the heavy object was put.
4. This paper is folded into a corrugated shape with 1 cm as a partition, and the new bridge is completed.
5. Come back the paper bridge and see, this time the heavy objects put them up steadily.
6. Cover the card paper into many thin strips and roll it into cylindrical bodies.
7. Sticking these cylinders side by side, what you see is another bridge.
8. Such a paper bridge is also very strong and has a lot of load -bearing capabilities.
The experimental principle: a piece of flat paper is very thin, and small force thickness leads to small tolerance. After folding the paper into a corrugated or rolled into a cylindrical body, the thickness of the force is greatly increased, and the tolerance is much greater. In the stress structure such as bridges and architecture, such a structure is often used, lightweight and solid, and saves many materials than solid structures. Think about it, what other structure can achieve this effect?
egg jet boat
. Experimental materials: eggs, cardboard, coarse wire, candle head, straw, double -sided glue, scissors, pliers.
. A 15 -centimeter -long and 15 -cm width -wide cardboard, drawing a folding line in a picture, it will be made into a hull.
3. Press the folding line to fold the hull.
4. Stick double -sided adhesive on the two ends of the boat, fold inward, and stick well.
5. Cut a rudder
. Cut a vertical seam in the middle of the stern, plug in the rudder, and wear two thick iron wires in the middle of the ship. The interval is 3 cm. The middle part of the iron wire is slightly curved.
7. Turn a small hole on one end of the egg, and the other side is tied side by side with two small holes, blowing from an entrance to the egg to the eggs, so that the contents of the eggs flow out of the other end.
8. Cut the straw into two 4 cm long (jet pipes), insert it in two holes in one end of the egg, a depth of about 1 cm, and then seal it with wax.
9. After the other end of the egg (note that the water level should be below the jet pipe), seal the mouth with double -sided glue. This is a small boiler.
10. Make a stove now! Put the candle head on the bottom of the ship (in the middle of 2 iron wires) and lit. A bottle cap can be matched under the candle.
11. Put the egg boiler on the thick iron wire, and the jet pipe levels are backwards. After a while, the water boiled, a steam sprayed out of the jet tube, and the boat was advancing in the water! If its rudder deflection has a certain angle, the boat will circulate in the water.
The experimental principle: The steam that is continuously generated after the water can only be discharged from the jet pipe, so there is a backward effect, and this force has a forward force on the boat. So the boat drove forward. This is in line with Newton's third law. Each force has an equal reaction force.
The ping pong dolls
1. Let's make a cute doll again. She is also made of those small items around us. It's your favorite.
Materials and tools: bath balls, various colors of cardboard, table tennis, velvet threads, velvet balls, pills, small items that can be used as eyes, double -sided glue, scissors.
2. Cut a hole with a diameter of 1.5 cm in the middle of the table tennis.
. Cut a piece of upper end of 5.5 cm in width, 10 cm width at the lower end, and 11 cm long trapezoids. Paste double -sided glue on one beam to form a pillar body. Finally, the pillar body is formed. Finally Cut the upper and lower end with scissors, which is the doll's body.
4. Cut a small nylon net on the bath ball, wrap it on the pillar body, and stick it with double -sided glue.
5. Insert the upper end of the pillar into the cave on the table tennis, the doll's head is connected with the body.
6. Cut a piece of 10 cm long velvet, adhere to the back of the body with both sides, and then bend to make a doll hand.
7. Eliminate a small braid with a velvet.
8. Use double -sided glue to stick the braids on the head of ping -pong dolls, stick two velvet balls on the bottom of the pillar, and stick your eyes and mouth on the tabletop face.
9. Cut a card paper that is equivalent to table tennis, and use double -sided to glue on the head of ping -pong dolls as a hat, and flatten the upper end with your fingers.
10. Stick one and a double -sided glue in the middle and tops of the hat, and stick the colorful velvet balls one by one as a hat accessories. Sticking to the neck. You see, ping -pong dolls are laughing at you.
Necholon small pendants
A many New Year, students have received a lot of New Year's money. Have you ever thought about the New Year's bag that put on New Year's money and can become a beautiful and festive small pendant? Intersection
1. Materials and tools: 12 New Year bags, 1 China knot, one silk (thin rope), tape paper, double -sided glue.
2. Fold each New Year's bag first, and then fold the four corners to the creases in the middle.
3. Paste the double -sided glue at the bottom of each angle.
4. Circle silk threads and knots. One end of the tape paper passes through the wire thread, sticks to the wire thread, and the other end sticks to the inner side of the New Year's bag (tightly creased). In this way, the hanging wire wire is fixed. Be careful not to expose the tape.
5. The four New Year bags with silk threads are sticking to the corner of the folding angle. This is the top of the pendant.
6. Take another folding New Year's bag, sticking China to the inside like a sticky hanging wire. Then stick the four New Year bags, including it, and stick the corner to the corner. This is the bottom of the pendant.
7. There are 8 folding angles on the top and bottom of the pendant, so the remaining four New Year bags are also touched in the middle of them.
8. After the bottom and the top are connected through the four New Year bags, the pendant is completed. Is it good? rnrn 会吼叫的小盒子rnrn 一、实验材料：一个纸（木或铁）盒、一支铅笔、一段绳子、一块松香、彩笔、胶水、 White paper.
. Tie the rope to the middle of the pencil.
. Wipe the rope with a rosin, just like the bow string of the instrument, make it astringent. rn 四、在盒子的一边开一鲂】祝���哟┕�】祝�Ρ柿粼诤凶拥睦锩妗?BR> 五、在盒子外面包上白纸，用胶水粘好Essence
6. Draw a lion on the box or other guys with a big voice. The tail should just be aligned with the exit of the rope.
Seven. Hold the box with one hand, and to push the rope with the index finger and thumb of the other hand, yeah, you hear the roar of the lion ... Experimental principle:
The friction sound of the rope passed to it to the rope to the sound of the rope to the sound of the rope to the pass to the sound of the rope to the sound of the rope. After the box, the walls are vibrated and sounded. In this experiment with different shapes and different materials, the sounds will be different, and sometimes the sounds can be shocking. The sound of string instruments is to use this principle, such as violin, cello, etc.
Makone zither
1. Materials and tools: one empty wooden box or hard paper box, triple board or a strong hard cardboard, several coat bands, and scissors.
2. Cut the three -in -board or hard cardboard into a right triangle, and cut a small gap every 1 to 2 cm every 1 to 2 cm.
3. Stick the cut straight corner triangle in the middle of the empty wooden box, pull the rubber band long in the box and beveled gap.
4. Dipping the rubber band, try, can you play 1-2-3-4-5-6-7 ... You can adjust the scales of the rubber band tightly.
Ilisaine pendants
The new semester began, and the students gathered happily. During the spare time, try to make a few small pendants, leave it to yourself, or give it to teachers and classmates, and entrust a sincere wish.
1. Materials and tools: Golden paper (can also be replaced by other colored paper), Chinese knot, KT blowstab (also use color cardboard instead), fine wood strips, fine lines, double -sided glue, paper cutter knife knife knives ,Scissors.
Axibly pistol
The students, if you can have a submarine mirror, you can clearly see things in the distance, such as being blocked by a tall man. The situation on the sea is the same. Very interesting, let's do one now.
1. Preparation of production materials: thick card paper, small mirror of 10 × 7.5 cm on both sides, scissors, double -sided glue, triangle, knife, pencil.
. The thick card red is cut into 31 × 40 cm size. The line is drawn on the card paper according to the figure. The four parallel lines are 7.5 cm separately. The square in the lower right corner is also the same size, and a 4 -centimeter diameter circle is drawn in the middle.
3. Cut the "×" square and the circular shape in the lower right corner, fold the four parallel lines inward, and apply double -sided glue on the narrow side of 1 cm on the side. The long pillar, the square and circles just cut into two small windows in the opposite direction.
4. Take out the glass in the small mirror and put double -sided glue on the four sides.
5. Two pieces of glass and no windows shall be used to stick the angle of 45 degrees in the long column. Note that the position of the two pieces of glass after sticking should be parallel. Note that the window and the inside of the column should not be blocked.
6. The cutting square is glued to the top of the long pillar with double sides, and the small subtitralsted mirror is done. You can use it to see a lot of unexpected things. The experimental principle, because the light is reflected twice by the mirror, and is transmitted in the mirror body (long pillar), how long your subtastic telescope body does, how long your sight can extend.
The writing with "invisible" ink
In adventure novels, you can often read the secret letter or treasure map written by "invisible" ink ... To unveil. Today we will learn how to write this kind of secret letter ...
1. Ordinary white paper, pen, lemon.
2. Cut a lemon into half, this is your "invisible" ink.
3. Press the pen into the lemon flesh to make the pen tip invade lemon juice. But don't be too much, otherwise it will drop.
4. Use this special ink to write your "secret letter" on the paper. Use some force when writing to make the stroke thicker. The word written with a thick pen tip is the best.
5. Lemon juice is dry quickly, and the words you write are nothing.
6. Slowly bake the paper with a lighter. Be careful not to burn the paper, otherwise you will never be gone! During the heating process, the invisible handwriting gradually becomes brown characters, and this letter can be read!
In small phone
1. Experimental materials and tools: paper cup (or empty tank box) 2, one section of long rope, color paper, scissors, double -sided glue, can be taken as a time Small balls of eyes.
2. The two microphones of the small phone are cute cartoon partners. Let's let them live. First cut the "parts" of a little frog with green paper -forelimbs, hind legs, eyes, etc.
3. Stick these parts into a paper cup to make it a little frog.
4. You can also use this method to make a puppy or other small animals you like and paste it on another paper cup.
5. In the center of the cup of two paper cups (now it has become a cartoon tube), a small hole is made in the center of the center.
6. Put a long rope (length above 10 meters) into the small holes at the bottom of the cup, and then knots.
7. After the small phone is made, put one microphone of the small phone in the ear, and then ask your friends to hold another microphone and stand 10 meters away from you (if the length of the rope is 10 at 10 If you are above the rice, you have to stand farther away from you. That is: the length of the rope is the distance between the two), singing or speaking in the microphone. The rope should be tightened and cannot be exposed to other things.
8. Although you and your friends are 10 meters away, you can clearly hear his voice. Experimental principles: Your friend singing and speaking sound will vibrate the bottom of the paper cup (microphone), vibrates along the rope to the paper cups in your ear, and causes vibration. Can clearly hear your friend's voice. (This is much clearer than the same distance between you and the same volume, because the effect of the sound spread in the solid is better than spreading in the air.)
obedient and disobedient eggs
. Experimental materials: several eggs, some sand, candles, signs or watercolor pens, color paper.
. Take two eggs, pierce a hole on the small end, pour the egg and green egg yolk inside and dry the empty egg shell.
. In the empty eggshell, it is installed with sand with a total volume of about 1/4 to 1/3, respectively.
. Take out one of the eggshells installed with sand, and you will be surprised by the obedience of this egg. What posture do you keep this egg in what posture you keep? You can also keep it balanced on various slope, but the surface should not be too slippery. If you seal the above mouth, it can still stand down with a small head. But in order to keep it holding your posture, you better knock it a few times and let the sand inside be in a horizontal state.
5. Pick up another egg shell installed with sand, let it stand upright and tap a few times to let the sand be in a horizontal state, and lit the candle to let the wax oil drip on the sand to fix the sand.
6. This is made into an obedient egg. No matter what posture you put it, it always goes back to its original posture. If you use color paper to make a small hat for it, and then draw a cute face, it will become an interesting tumbler. Experimental principles: The original focus of the egg is in the middle, and it is difficult for you to "obedient" or "disobedience". After installing the sand, the center of gravity of the egg is on the sand. Before the sand was not fixed, as the egg posture changed, the center of gravity of the sand was the lower part of the egg in the posture. And when the sand is fixed to the lower part of the egg, it also makes it a tumbler due to the principle of gravity.
The snake -shaped windmills on the candle
. The production material: large head needle, empty rubber roll box, candle, fine plastic straw, pencil, cardboard, scissors.
. Draw a spiral line on the card paper, and draw the head shape of a snake at the end.
. According to the figure, cut it along the line, and a small hole must be poked in the middle. You can just pass through a fine plastic straw. This is a snake -shaped windmill.
. Began to be a tripod now. First insert a large needle on the rubber head of the pencil, then cut a small cut plastic straw and sealed one end, and put it on a large head needle to become a hats.
. Open a round hole on the top of the glue roller and insert a pencil vertically.
6. The small holes in the middle of the snake -shaped windmill pass through the hood, and the windmill is completed.
Seven, lit the candle below the windmill, you will see that this snake starts to rotate. If the windmill is placed on the top of the stove or heate, there is the same effect. Why does this phenomenon appear? Because the warm air is lighter than the cold air, rising warm air can promote the rotation of the windmill. In daily life, in the room, the rising warm air has been rising, flowing along the sky flower board to the window, being cooled by the window and falling to the floor. The warm air of heating) rises, which can increase the gliding machine.
The answer is you satisfied?
Frost is the flower of the seasons in autumn, it is the fat of light in autumn, and it is the fire of red thoughts in autumn. Imagine what will happen to the autumn without frost, and can the chrysanthemum that blooms in the late autumn still proud?