1. Accurately grasp the light. There are many stage magic tricks that use the lens to distort the light. And a flat mirror. There is a very common technique, that is, a flat mirror is placed obliquely in a square paper box or carton, and many props can be placed under the mirror, which will be an empty box for the audience.

2. Master mechanics and realize some simple suspension by using the principle of moment balance. Tilt like that.

A large part of the magic show relies on the phenomenon of "anti-physics" to achieve the effect of surprising the audience. The audience thought it impossible from what they had learned before, but the magician did it. That kind of heartfelt joy and surprise can only be achieved by magic. Therefore, magic can only achieve this "anti-physics" effect after further study of physics.

2. Physical knowledge in magic.

The little magician who jumped coins in the bottle took out a bottle and explained that it was empty. He put a little oil on the bottle mouth, and then took a nickel from his pocket and covered it. He dried the bottle on the alcohol lamp and put it back on the table. He rubbed his hands hard for a while, then put them on the water to dry them, and suddenly he grasped the bottle with his hand. The coin on the bottle mouth seems to have been bounced by something and jumped up from the bottle mouth. Slapped on the table with a bang. The secret is actually the phenomenon of "thermal expansion and cold contraction". The air in the bottle will expand when heated. During the performance, the bottle is heated and the hands are warm. When holding a bottle, the heat in your hand can raise the temperature of the air in the bottle and expand its volume, so push it out of the bottle mouth and rush the coins up. The little magician performed another trick similar to "jumping coins in a bottle". Say to everyone: "this glass bottle is elastic, it can be squeezed flat, and the water in the bottle can be squeezed out, just like a rubber bottle." The little magician knocked the bottle several times with a wooden stick and made a "Dangdang" sound, which proved that the bottle was glass. Then he put down the stick, put his hands together and rubbed it hard for a while, then hugged the bottle and made a gesture of squeezing it hard. Strangely, when he squeezes the bottle hard, the bottle mouth will spray water upwards. Secret magic is also designed according to the principle that objects expand when heated. To perform this magic trick well, you must fill the bottle with water, close the bottle cap and drill a small hole in the bottle cap. After rubbing your hands (preferably dry them), hold the bottle tightly. The water in the bottle will come out of the small hole in the bottle cap after it is heated and expanded. The performer who burned handkerchiefs asked his assistant to light handkerchiefs with matches.

Turn off the lights at the same time, and the handkerchief burns in the air. When the fire went out, I turned on the light and saw that the handkerchief was still the same, and it was not burned out.

Before the performance, soak the handkerchief in water, hold it in your hand and then dip it in alcohol. Alcohol burns when it meets fire, so it burns alcohol instead of a handkerchief.

As we all know, anything with holes will leak. Now, however, you will see a thin piece of paper full of holes, which can actually lift one kilogram or even two kilograms of water without leaking.

1. An equipped empty bottle, a piece of paper with many holes punched with a big needle, and a large glass of colored water. 2. During the performance, the big empty bottle is filled with colored water; Cover the bottle with perforated paper, press the paper with your hand, turn the bottle upside down, as shown in the figure, and then gently remove your hand.

The paper still covers the bottle mouth, and water doesn't flow out of the hole. When performing, you should pay attention to the small mouth of the bottle (such as a big mouth bottle and cardboard). The more water you hold, the better the effect.

After pouring the bottle, move your hands slowly and gently to avoid paper leakage or even pouring water out. 3. Explain that tissue paper can hold up the water in the bottle because atmospheric pressure acts on the paper, resulting in upward pulling force.

Water will not leak out from the small holes because water has surface tension, and water forms a water film on the surface of paper, so water will not leak out. This is like an umbrella made of cloth. Although this cloth has many holes, it still won't leak rain.

The drill sleeve holds the table tennis ball that has been wiped for half a minute, and lets go to let the ball fall freely. You will see that the ball didn't fall vertically, but took an arc and even got into your sleeve.

The ball follows the hand. Put the table tennis ball with rubbed hands on the smooth table and approach it with your hands. Look! Table tennis rolls in the direction of the hand. If you move it manually, it will follow.

The match stood upright. Touch a matchstick on the table with a wiped ping-pong ball. Lift it slowly, and the matchstick will raise its head and even stand upright. Rub table tennis for a while, about 1 minute, then hold the ball in your palm, and then start slowly with your palm facing down.

How interesting! Table tennis just rolls slightly in the palm of your hand, but it won't fall off. Note: The above experiment is because gloves and table tennis are charged after friction, so they can attract each other and light and small objects.

Blow off the hat. This is an ancient magic popular in Europe and America. (1) vanity mirrors (60cm*80cm) are arranged vertically and horizontally on the experimental platform.

(2) Prepare students to stand in front of the mirror and watch with their faces facing one end of the mirror every time they enter the room. The teacher went to the other end of the mirror, ordered the students to close their eyes, then put on their hats, put their faces and bodies close to the vertical edge of the mirror, and made a half face (no more, no less! ) Behind the front half of the mirror.

Then let the students open their eyes and look at him in the mirror. (3) The performance teacher said to the students, "Look, I have put my arm out horizontally. Please blow the hat on my head. "

After the students finish blowing, they will see the hat on the teacher's head fly and then fall on his head. (4) The expression of mystery skillfully uses the symmetry of objects and images in plane mirror imaging. The teacher that students see in the mirror is half entity and half image.

In fact, the teacher only stretched out one arm, but what the students saw was that the two arms stretched out horizontally. After the students finished blowing, the teacher raised his hat with one hand behind the mirror. Because the student's face is stuck to the mirror, she can't see the movement, only the hat is blown up by her.

Look at the chicken in the egg. You can use the characteristics of shadows to perform an interesting thing for your partner. Take a piece of paper soaked in oil and stick it on the square hole in the middle of a piece of cardboard to assemble an oiled paper curtain.

Put two lights behind the curtain; Please ask your audience to watch in front of the screen. Now, light a lamp, such as the one on the left.

Between the lighted lamp and the paper curtain, an oval cardboard was added, so the image of an egg appeared on the curtain (the lamp on the right has not been lit yet). Now you can tell your audience that the X-ray machine is about to start, and you can see the inside of the egg … and the chicken! Sure enough, your audience will suddenly see that the edge of the egg seems brighter, but the central part is darker, and you can clearly see the image of a chicken (Figure 84).

In fact, there is not much mystery in this magic. To put it bluntly, it is very simple: in front of the lamp on your right, there is a piece of cardboard with a chicken embryo on it. After lighting this lamp, on the oval shadow on the screen, there is a "chicken chicken" shadow coming out of the right lamp, and the chicken chicken shadow is illuminated by the right lamp.

3. Physical knowledge in magic.

1 steel needle penetrates glass (the relationship between pressure and kinetic energy) First, a complete glass is put in the air, and then the performer will try to let a tiny steel needle penetrate the glass.

Some people think that the hardness of steel is much greater than that of glass, because glass can't stand beating, and it will break when it falls, while steel is extremely tough. If you hit ordinary glass with an iron bar, it is not difficult to break the glass, but don't think that you can easily break the glass with a steel needle.

In fact, the hardness of glass is greater than that of steel. If you carve steel on the glass, you will find that there is no "masterpiece" of steel left on the glass. On the contrary, glass can leave traces on steel at will. This is enough to prove that iron is not harder than glass.

If you want to ask why iron can easily break glass, it comes down to the texture of the glass itself. Glass is hard and brittle, and it is easily broken by strong impact, which also explains why glass is harder than iron, but it is easily broken by iron.

When iron hits the glass violently, it needs to generate enough impulse to break it, which requires iron itself to have a certain quality, but only a small steel needle is used in the magic. Obviously, it is not feasible to rely solely on the quality of the steel needle itself to break through the glass.

At this time, two simple knowledge are needed to solve it. The first is the problem of pressure and stress area.

We all learned in junior high school that under the same pressure, the smaller the stress area of the object, the greater the effect. This is why people should make one end pressed by hand flat and large when making thumbtacks, instead of reducing its area in order to save labor costs.

This magic is also true. Through the tip of the steel needle, the glass is relatively easy to pierce.

But glass is much harder than walls and wood, unlike pushing thumbtacks by hand to solve problems. This leads to another knowledge-the relationship between kinetic energy and speed.

The magnitude of kinetic energy is related to the mass and velocity of an object. Here, it is obvious that tiny steel needles cannot improve kinetic energy through mass. So the speed of steel needle is the key to the success of magic.

The greater the speed of motion, the greater the energy generated when hitting an object. Accidents that high-speed planes are punctured by birds in the air often happen.

The bird can pass through the steel plate of the plane, so you can imagine how amazing the power was at that time. Everyone knows what will happen if the earth is hit by an asteroid.

1994, scientists photographed an asteroid with a diameter of about 50 kilometers in close contact with Jupiter. There was a huge explosion on Jupiter, covering an area even larger than the whole earth. If Jupiter is not huge enough, I'm afraid there are only eight planets in the solar system today. Asteroids can produce such amazing power because they are influenced by gravity and have enough speed when they hit.

Punching through the glass requires both of the above conditions. Ensuring vertical contact with the glass and reaching a certain speed depends on the performer's skill. 2 obedient fountain (charge interaction) We must first simulate a scene and then analyze its essence.

A little magician asked his assistant to move a very beautiful bonsai, including a rockery, a pool and pavilions, which embellished the whole scene with vitality, and a striking spring water gushed out from the rockery. The magician picked up a glass rod from the table and said to the audience, "The fountain in this bonsai can understand me."

After that, he began to command the fountain with a glass rod. However, no matter whether his glass rod pointed to the left or right, the fountain didn't respond, so that the glass rod was sprayed with water and still didn't work. Even the audience thought that the magician's baton was out of order.

However, the magician is in no hurry. He wiped the water drops on the glass rod with a piece of silk, rubbed it hard a few times, then shook the glass rod on the left of the fountain a few times, only to see that the fountain tilted slightly to the right, and then shook the glass rod on the right of the fountain, and the fountain tilted slightly to the left. This is a simulated scene, so why should the fountain obey the command? First of all, pay attention to the magician's action of cleaning the glass rod. The friction between silk and glass rod will make the glass rod lose electrons and be positively charged, so will the water droplets sprayed in bonsai. According to the principle that like charges repel each other, when the glass rod is close to the spring, the fountain will deviate in the opposite direction and play the role of "command".

In addition, the magician's performance was unsuccessful from the beginning, and the glass rod was sprayed with water, completely to cover up the action of wiping the glass rod with silk cloth and rubbing it hard to make it positively charged. The cotton magic (heat transfer) that can't be done at 3 o'clock only needs a coin and a piece of cotton cloth.

Wrap a coin in a piece of cotton cloth and tie it tightly. At this time, you tie the lit cigarette to the cotton cloth until it goes out. You will be surprised to find that not only does the cloth not catch fire, but it can't even zoom, leaving only a smoke spot.

Is cotton cloth magic? Actually, it's not. Experiments show that metal conducts heat faster than cotton. When fireworks touch cotton cloth, the heat is immediately absorbed by coins. It is impossible for cotton cloth to reach the lowest combustion temperature, that is, the ignition point. Therefore, the cloth will not burn.

This is the use of heat to transfer knowledge. Heat transfer knowledge also has many applications in life, such as frying pan, which is made of metal with good heat transfer. 4 magic box (gravity and center of gravity) The magic described below is called the magic box.

I saw that the performer had a black box, which was closed all around and looked a little mysterious. The performer carefully placed the box on the table and gradually pushed it onto the table with his wand. A strange scene appeared. When the box was pushed to the table by the wand, it didn't fall off and looked stable.

In order to convince the masses, the performer deliberately picked up the box for inspection to make sure there was nothing special on the desktop. The audience was surprised by this.

Is the box really magical, or does the performer have special functions? From a scientific point of view, obviously not.

In fact, there is a mystery hidden in the box. First, the box is processed. Make a sandwich at the bottom of the box and put a heavy thing at one end, which can be lead or iron. In this way, the box is endowed with magic.

As we know, any object has a center of gravity, that is, the resultant point produced by the gravity of all parts of the object. A cuboid box with uniform density, the center of gravity falls in the center of the box.

4. Ask for some physical tricks.

Jump coins in the bottle and take out a bottle, explaining that it is empty. He put a little oil on the bottle mouth, and then took a nickel from his pocket and covered it. He dried the bottle on the alcohol lamp and put it back on the table. He rubbed his hands hard for a while, then put them on the water to dry them, and suddenly he grasped the bottle with his hand. The coin on the bottle mouth seems to have been bounced by something and jumped up from the bottle mouth. Slapped on the table with a bang. The secret is actually the phenomenon of "thermal expansion and cold contraction". The air in the bottle will expand when heated. During the performance, the bottle is heated and the hands are warm. When holding a bottle, the heat in your hand can raise the temperature of the air in the bottle and expand its volume, so push it out of the bottle mouth and rush the coins up. The little magician performed another trick similar to "jumping coins in a bottle". Say to everyone: "this glass bottle is elastic, it can be squeezed flat, and the water in the bottle can be squeezed out, just like a rubber bottle." Knock the bottle several times with a wooden stick and make a "clang", which proves that the bottle is glass. Then put down the stick, put your hands together and rub it hard for a while, then hug the bottle and make it look like you are squeezing it hard. Strangely, the bottle mouth sprays water upwards. Secret magic is also designed according to the principle that objects expand when heated. To perform this magic trick well, you must fill the bottle with water, close the bottle cap and drill a small hole in the bottle cap. After rubbing your hands (preferably baking), hold the bottle tightly. After the water in the bottle is heated and expanded, it will come out of the small hole in the bottle cap. Burn the handkerchief, let the assistant light it with a match and throw it into the air.

Turn off the lights at the same time, and the handkerchief burns in the air. When the fire went out, I turned on the light and saw that the handkerchief was still the same, and it was not burned out.

Before the performance, soak the handkerchief in water, hold it in your hand and then dip it in alcohol. Alcohol burns when it meets fire, so it burns alcohol instead of a handkerchief.

As we all know, anything with holes will leak. Now, however, you will see a thin piece of paper full of holes, which can actually lift one kilogram or even two kilograms of water without leaking.

1. An equipped empty bottle, a piece of paper with many holes punched with a big needle, and a large glass of colored water. 2. During the performance, the big empty bottle is filled with colored water; Cover the bottle with perforated paper, press the paper with your hand, turn the bottle upside down, as shown in the figure, and then gently remove your hand.

The paper still covers the bottle mouth, and water doesn't flow out of the hole. When performing, you should pay attention to the small mouth of the bottle (such as a big mouth bottle and cardboard). The more water you hold, the better the effect.

After pouring the bottle, move your hands slowly and gently to avoid paper leakage or even pouring water out. 3. Explain that tissue paper can hold up the water in the bottle because atmospheric pressure acts on the paper, resulting in upward pulling force.

Water will not leak out from the small holes because water has surface tension, and water forms a water film on the surface of paper, so water will not leak out. This is like an umbrella made of cloth. Although this cloth has many holes, it still won't leak rain.

The drill sleeve holds the table tennis ball that has been wiped for half a minute, and lets go to let the ball fall freely. You will see that the ball didn't fall vertically, but took an arc and even got into your sleeve.

The ball follows the hand. Put the table tennis ball with rubbed hands on the smooth table and approach it with your hands. Look! Table tennis rolls in the direction of the hand. If you move it manually, it will follow.

The match stood upright. Touch a matchstick on the table with a wiped ping-pong ball. Lift it slowly, and the matchstick will raise its head and even stand upright. Rub table tennis for a while, about 1 minute, then hold the ball in your palm, and then start slowly with your palm facing down.

How interesting! Table tennis just rolls slightly in the palm of your hand, but it won't fall off. Note: The above experiment is because gloves and table tennis are charged after friction, so they can attract each other and light and small objects.

Blow off the hat. This is an ancient magic popular in Europe and America. (1) vanity mirrors (60cm*80cm) are arranged vertically and horizontally on the experimental platform.

(2) Prepare students to stand in front of the mirror and watch with their faces facing one end of the mirror every time they enter the room. The teacher went to the other end of the mirror, ordered the students to close their eyes, then put on their hats, put their faces and bodies close to the vertical edge of the mirror, and made a half face (no more, no less! ) Behind the front half of the mirror.

Then let the students open their eyes and look at him in the mirror. (3) The performance teacher said to the students, "Look, I have put my arm out horizontally. Please blow the hat on my head. "

After the students finish blowing, they will see the hat on the teacher's head fly and then fall on his head. (4) The expression of mystery skillfully uses the symmetry of objects and images in plane mirror imaging. The teacher that students see in the mirror is half entity and half image.

In fact, the teacher only stretched out one arm, but what the students saw was that the two arms stretched out horizontally. After the students finished blowing, the teacher raised his hat with one hand behind the mirror. Because the student's face is stuck to the mirror, she can't see the movement, only the hat is blown up by her.

Look at the chicken in the egg. You can use the characteristics of shadows to perform an interesting thing for your partner. Take a piece of paper soaked in oil and stick it on the square hole in the middle of a piece of cardboard to assemble an oiled paper curtain.

Put two lights behind the curtain; Please ask your audience to watch in front of the screen. Now, light a lamp, such as the one on the left.

Between the lighted lamp and the paper curtain, an oval cardboard was added, so the image of an egg appeared on the curtain (the lamp on the right has not been lit yet). Now you can tell your audience that the X-ray machine is about to start, and you can see the inside of the egg … and the chicken! Sure enough, your audience will suddenly see that the edge of the egg seems brighter, but the central part is darker, and you can clearly see the image of a chicken (Figure 84).

In fact, there is not much mystery in this magic. To put it bluntly, it is very simple: in front of the lamp on your right, there is a piece of cardboard with a chicken embryo on it. After lighting this lamp, the oval shadow on the screen has a "chicken" shadow from the right lamp. The chicken's shadow is illuminated by the right lamp, so the edge of the "egg" is brighter than its central part.

What about your audience? He is.

5. Is there any magic related to physics?

Cotton cloth that can't be ignited-the magic of heat transfer of objects only needs a coin and a cotton cloth.

Wrap a coin in a piece of cotton cloth and tie it tightly. At this time, you tie the lit cigarette to the cotton cloth until it goes out. You will be surprised to find that not only does the cloth not catch fire, but it can't even zoom, leaving only a smoke spot.

Is cotton cloth magic? Actually, it's not. Experiments show that metal conducts heat faster than cotton. When fireworks touch cotton cloth, the heat is immediately absorbed by coins. It is impossible for cotton cloth to reach the lowest combustion temperature, that is, the ignition point. Therefore, the cloth will not burn.

This is the use of heat to transfer knowledge. Burning Handkerchiefs-Vaporizing heat-absorbing performers ask assistants to light handkerchiefs with matches and throw them into the air.

Turn off the lights at the same time, and the handkerchief burns in the air. When the fire went out, I turned on the light and saw that the handkerchief was still the same, and it was not burned out.

Description: Before the performance, soak the handkerchief in water, hold it in your hand, and then dip it in alcohol. Alcohol burns when it meets fire, so it burns alcohol instead of a handkerchief.

The water on the cloth vaporizes and absorbs heat, so that its temperature can not reach the ignition point, so the handkerchief will not burn. Take something from the oil pan-the boiling point of the liquid. Pour one part of vinegar and two parts of oil into the oil pan. After a while, the oil and vinegar in the pot churned up and down. At this time, the performer reached into the pot to get something, but his hand was not injured! This is because vinegar is incompatible with water.

Vinegar is less dense and sinks to the bottom, while oil floats on it. The boiling point of vinegar is very low, and the temperature after boiling is not very hot.

Water bag nail plate-pressure is related to area. Use the example of a magician lying safely on a nail board to arouse students' memories. Then use a plastic bag (a little thicker) to fill the bag with water, tie the bag tightly, and put it on a nail board with many nails first, so that students can observe whether the bag is punctured. Then take it off and put it on a nail board with only three nails. As a result, the students found that the plastic bag was punctured and leaked. Using this wonderful experiment, students can easily sum up the reasons and form concepts, which are not easy to forget, and also make students excited and improve the teaching effect.

The magic bucket takes water to offer love-the siphon puts a small plastic bucket on the middle table. A piece of black buffon was used on the bucket, and nothing could be seen inside. A plastic tube the thickness of a little finger sticks out near the bottom of the bucket. At the beginning of the performance, she held a glass of water in her hand and said, "Students, we should all have a love, because when you give your love to others, others will give you love.".

Now there is a lovely magic bucket that I haven't drunk for centuries. Now I want to dedicate this glass of water in my hand to it. "I saw him lift the black cloth that sealed the bucket slightly, and then slowly pour the water in the cup into the bucket, with his mouth still" drinking slowly and choking carefully "like a child. Everyone only saw that she had just emptied the water in the cup, and then found that there was water flowing out of the tube under the bucket. This classmate. This bucket has been giving us love and rewarding everyone. "I saw him take the water from the inside with the cup in his hand. After filling a cup, he poured the water into the next basin. I saw that he took 1 cup, 2 cups, 3 cups, ... and after taking 10 cups continuously, there was still water flowing out of the pipe. At this time, the classmate added a humorous sentence, "The classmates all saw that as long as you give a little love to others, you may get a steady stream of returns." Therefore, students should do more good deeds and give others more love! " At this moment, there was a burst of warm applause.

In fact, the secret lies in that the pipe in the bucket is tied into a siphon with thin iron wire in advance, and a glass of water is filled, so that the water surface will exceed the top position and be sealed with black cloth. As long as some water is added during the performance, water will flow out of the siphon under the action of water pressure.

Perforated paper holds water-atmospheric pressure As we all know, anything with holes will leak. Now, however, you will see a thin piece of paper full of holes, which can actually lift one kilogram or even two kilograms of water without leaking.

1. Equipment: a big empty bottle, a piece of paper with many holes punched by a big needle, and a large glass of colored water. 2. Performance process: Fill a big empty bottle with colored water; Cover the bottle with perforated paper, press the paper with your hand, turn the bottle upside down, as shown in the figure, and then gently remove your hand.

The paper still covers the bottle mouth, and water doesn't flow out of the hole. When performing, you should pay attention to the small mouth of the bottle (such as a big mouth bottle and cardboard). The more water you hold, the better the effect.

After pouring the bottle, move your hands slowly and gently to avoid paper leakage or even pouring water out. 3. Description: Tissue paper can hold up the water in the bottle because atmospheric pressure acts on the paper, resulting in upward pulling force.

Water will not leak out from the small holes because water has surface tension, and water forms a water film on the surface of paper, so water will not leak out. This is like an umbrella made of cloth. Although this cloth has many holes, it still won't leak rain.

Balloon sucker-The atmospheric pressure performer puts the balloon mouth in his mouth, slowly blows into it, touches the cup mouth at the lower end of the balloon with his hand, and then blows into the balloon. After a while, let go of the hand holding the teacup, and the teacup was sucked by the bulging balloon.

Then pinch the balloon mouth tightly by hand to prevent air leakage. At this time, we can also carry the balloon to make it move, so that the teacup will not fall off.

We can also perform with the aluminum lids of two thermos bottles. Cover the balloon with both hands on the left and right. After the balloon was inflated, both covers were sucked by it.

If the balloon is bigger (about two or three times bigger than the cup mouth), the performance will be better. During the performance, the balloon must be covered with cups and other things before it is inflated.

Phenomenon explanation: Why can an inflated balloon hold a teacup? When blowing air into the balloon, a small part of the balloon surface is trapped in the cup before the balloon expands. When the balloon blows up, its surface sticks tightly to the mouth of the cup and becomes flat. The balloon part that used to occupy the cup is not all in the cup now.

At this point, the gas in the cup becomes thin, the air pressure decreases, and the atmospheric pressure presses the cup tightly on the surface of the balloon without falling. The idea of lifting the washbasin-atmospheric pressure program, the performer with a modest smile on his face, holding his breath, luck, stamping the ground, stretching his waist, after a series of beautiful and exaggerated actions,