Views: 5 Author: Site Editor Publish Time: 2021-05-28 Origin: Site
Most children like ball games. But kids, do you know what happens if two balls bounce together? What is the physical science secret behind the bounce of the ball? Today, Alpha Science Classroom presents a simple Energetic 2-ball Bounces kids science experiment for children and explores the secret with kids together. Alpha science classroom not only helps children learn physical science experiment s knowledge of Ball bouncing and let children enjoy the fun of science happily.
Alpha science classroom：Energetic 2-Ball Bounces Materials
A basketball or other large bouncing ball
A tennis ball or other bouncing ball that is smaller and lighter than the bigger ball
A ping-pong ball, smaller and lighter than both other balls (optional)
A hard surface to bounce balls, preferably outdoors, surrounded by a large open area where a ball can fly without colliding with people or objects
A helper (optional)
A camera that films video (optional)
The yardstick that measures meters (optional)
Alpha science classroom：Energetic 2-Ball Bounces program
First, children keep the larger ball at shoulder height and let it fall without pushing it. How high does it bounce back almost all the way to your shoulders, hips, knees? Repeat several times. Do the children bounce back to about the same height every time the ball bounces? Repeat the first step with the smaller ball. How high did the ball rebound?
Do you think that the height of the ball bounced back will be higher than the height of your release?
If your ball does not bounce well, it may be deflated or too old. You can add air to some balls such as basketball, football, volleyball, etc. A bicycle pump with special parts can inflate the ball and help you complete your work. Other balls (such as tennis or baseball balls) will wear out with use. Why do you think the deflated ball does not bounce well? Why can't I bounce with a good tennis ball?
The children put the larger object at shoulder height as before. Place the smaller balls on top of the larger balls so they can touch and stay there. You may need a helper to hold the ball in place. Later, you will release two balls at the same time. What do you think will happen? Will larger objects fall faster, or will they stay together as they fall? How will they rebound? Will the ball bounce higher, the same, or lower than before?
The children try and observe. You may need to try a few times to determine the correct time. Is your prediction correct? Can you explain what you observed?
Repeat the previous step several times. Are the results consistent? Compare the quality of the ball. The top ball (smaller ball) is heavier or lighter than the bottom ball?
As in the beginning, keep the smaller ball at shoulder height, and then place the larger ball on top. What do you think will happen when you release two balls at the same time?
The children undergo several tests. Is your prediction correct? Can you explain your opinion? Note that before, the larger ball (bottom ball) may be heavier than the smaller ball (top ball), but this time, the top ball is heavier.
Alpha science classroom：Energetic 2-Ball Bounces Observation results
The alpha science classroom would like to ask whether the children found that no matter what kind of ball is used, a single ball will not bounce to the height at which it was released? During the collision, some of the energy of the ball is converted into heat. Since no energy is added to the ball, the ball bounces with less kinetic energy and therefore cannot reach the same height. If you give the ball an initial thrust, you will increase the energy and the ball may bounce back to a higher position.
A well-inflated ball bounces better because there is more air in it. This makes it possible to push back faster, thereby reducing the contact time and contact area in a collision, thereby reducing the amount of heat generated. There is also air inside the tennis ball, but it cannot be re-inflated.
Did the children see how the lighter ball was shot into the air when the heavier ball was released at the same time? The two balls fall at the same speed, but the heavier ball gains more energy during the fall. When the lighter ball bounces on the heavier ball, they exchange energy, and the lighter ball flies away with some of the energy of the heavier ball. The height it reaches is higher than the height it was released. On the other hand, a heavy ball has almost no energy and does not move too much.
The Energetic 2-Ball Bounces physical science experiment for children in Alpha Science Classroom together with children came to an end today. Children can also use their imagination, try more baseball and other balls to test, I believe that the children will discover more interesting phenomena in physical science, and grow up to be excellent physicist.
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