What is the simplicity and principle of physics experiments?

The physics experiment is simple and the principle is as follows:

Ingredients: toothpick, a basin of water, soap, sugar cubes.

Operation: Place the toothpick carefully on the water; Place the sugar cube in a basin of water, away from the toothpick. The toothpick will move in the direction of the sugar cube; Change a basin of water, carefully place the toothpick on the surface of the water, and now put the soap in the basin closer to the toothpick. Toothpicks will stay away from soap.

Principle: When the sugar cube is placed in the center of the basin, the sugar cube will absorb some water, so there will be a small flow of water in the direction of the sugar cube, and the toothpick will also move with the water flow. However, when you throw soap into a basin of water, the surface tension on the edge of the basin.

It's stronger, so the toothpick will be pulled outward.

Galileo's acceleration test:

Galileo continued his research on the movement of objects. He made a smooth straight plank groove more than 6 meters long and 3 meters wide. Then fix the plank groove at an angle, so that the copper ball is inclined from the top of the trough.

Slide down. The time and distance of each slide of the copper ball is then measured, and the relationship between them is studied. Aristotle.

It was predicted that the speed of the rolling ball would be uniform: the copper ball would travel twice as long as it would travel twice as long. Galileo, however, proved that the distance traveled by which the ball rolls is proportional to the square of time: twice as long, the ball rolls four times as far. Because there is gravitational acceleration.

When you put the sugar cube in the center of the basin, the sugar cube will absorb some of the water, so there will be a small flow of water in the direction of the sugar cube, and the toothpick will also move with the water flow. However, when you put soap into the basin, the surface tension on the edge of the basin is stronger, so the toothpick is pulled outward.

The scientific experiments and principles are:

1. Track Strange Slope.

Every object in our lives is subjected to the gravitational pull of the earth, and this force is gravity. Due to gravity, the center of gravity of an object has a tendency to move downward (fall or roll), causing its center of gravity to keep lowering. In this experiment, when the two joysticks are parallel, the center of gravity of the ball is parallel to the two woods, so the ball rolls from the height of the wood to the low.

As the higher part of the shaft slowly separates, the ball is at the largest opening of the shaft and has a lower center of gravity than the lowest part of the shaft. Therefore, the ball tends to roll in the direction of the larger opening of the wooden pole and the lower center of gravity, forming a "strange slope" phenomenon.

2. Banknote magic paper clip.

When you gently pull the paperclips at both ends of the banknote, they will slide together, but the paperclips are still on the banknote. If you pull harder, the paperclip will overcome the force it is clamping. Since they are suddenly pinned together, the elastic force of the paper clips ejects the three paper clips, and they can be strung together.

In life, when you put the key into the keychain, you will also encounter this situation, and there will be a click elasticity.

3. Sluggish coins.

This experiment is thanks to Newton's first law. Newton said that objects in motion are accustomed to remain in motion, and objects at rest are accustomed to remain at rest – unless an external force is exerted on them. So what the coin wants to do is "stay on it".

In this experiment, the coin loses its load, and the coin is barely forced, "staying in place" by inertia, and then falling into the cup by gravity.

4. Catapults.

When we press the chopsticks of the primary version of the catapult, the force is stored in the middle of the bent pole, and when we release the hand and the pole returns to a straight line, the force generated will project the object.

When we press down the chopsticks of the upgraded catapult, the rubber band is deformed, and the deformation stores energy, which makes the rubber band have a tendency to return to its original state, which is called elastic potential energy. When we release the hand, the band releases elasticity, and the resulting force causes the object to be projected.

5. Magdeburg hemisphere.

In the beginning, we close the two hemispheres tightly together and they will be separated without force, because there is atmospheric pressure inside and outside the ball, and the action between them cancels each other out and balances. Later, we use a syringe to pump out the air in the ball, and the air pressure inside the ball decreases, and the atmosphere outside the ball tightly presses the two hemispheres, so it is difficult for us to pull them apart.

The scientific experiments and their principles are as follows:

1. Chopsticks to Timmi.

Inserting chopsticks into a bottle full of rice, it was found that one chopstick was able to lift the entire bottle of rice, which was caused by a lot of friction between the chopsticks and the rice, as well as between the rice.

2. White paper ruler.

This is a magical little experiment, the white paper is spread on the edge of the edge half of the ruler suspended on the desktop, the white paper and the desktop can be seen as full contact, there is less air between them, when the weight hits the ruler, due to the action of the force, the ruler will pick up the white paper upwards, at this time the air pressure between the white paper and the desktop is less than the atmospheric pressure, and the atmospheric pressure will press the white paper to prevent the ruler from bounce.

3. Bouncing bubbles.

Prepare water and dish soap into a mixed solution in a ratio of 3:1, take the solution with a straw, and blow out bubbles, but the bubbles are easier to break; Mix the glue and the mixed solution in a ratio of 1:2, and then use a straw to take the solution and blow out the bubbles.

Touching the bubble with gloves not only makes it difficult to break, but it also bounces when touched by hand.

Decryption moment: The bubbles in the bubble are explosive due to the evaporation of water, and they will become very sticky after adding glue, and the water will not evaporate easily, and the strength of the bubble film will increase, so it can jump on the back of our hands.

The scientific experiments and their principles are as follows:

1. Straw that penetrates the potato.

This experiment uses the force of air to pierce the potatoes through the force of air. We plug one end of the straw with our fingers, and the only outlet for the air in the straw is the end of the potato, and the volume of air in the straw becomes smaller at the moment of insertion into the potato, and the pressure on the surrounding area increases.

But this force is not strong enough to push the finger and the wall of the straw, and it can only be rushed out of the relatively weak potato, so we can use the straw to penetrate the potato.

2. Balance the bird.

The reason why the balanced bird is balanced is that after the paper clip is added, the center of gravity is moved forward from the middle of the bird's body to the beak, which means that the actual center of gravity of the whole bird is below the tip of the beak.

By placing the beak of the bird in your hand, like a basket hanging from your finger, the bird will be held securely.

Balance beam athletes can perfectly display a variety of difficult gymnastics movements on the balance beam, and it is also because the athlete can control his center of gravity well, so he can achieve a balanced state.

3. Running hoops.

In this experiment, we stretched the rubber band and then released the bottom, because the elastic rubber band contracted upwards to return to its original shape, there is static friction between the iron ring and the rubber band, which will rise with the rubber band.

And we cover the tapering bands with our hands, which are getting shorter, and it looks as if the hoops are rising on their own.