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The purpose of this project is to find what size and material should balls be made in order for them the bounce high. It is hypothesized that the lighter the material and the smaller the ball, the higher it will bounce. Each of the seven balls were dropped three times and I measured the bounce height. I figured out that the inflated balls bounced the highest. It would be interesting to find out what makes bouncy balls bounce so high. In future studies, other balls would be bounced and measured.

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Which material and size should balls be made of in order for them to bounce high?

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The lighter the material and the smaller the ball, the higher the ball will bounce.

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When you drop a ball, kinetic energy is at work. When the ball hits the floor, the molecules inside get compressed. The molecules suddenly push back out to get back into it's round form, which develops a push. That push springs the ball back upward, creating a bounce. This all happens in about a millisecond. But some materials, like silly putty, don't bounce because the molecules don't get compressed, and therefore don't push back.

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1. Baseball
2. Softball
3. Nerf ball
4. Kickball
5. Soccer ball
6. Plastic ball
7. Tennis ball
8. Painter's tape
9. Measuring tape
10. Another person

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1. Set up painter's tape vertically against the wall, about seven feet tall.
2. Weigh and measure each of the balls.
3. Make sure someone is standing near the tape.
4. Grab one of the balls, and drop it parallel to the railing.
5. When the ball drops, have the person measure the height on the first bounce with the measuring tape.
6. Have the person throw the ball back to you.
6. Repeat steps four to six two more times.
7. Drop the ball at the same height, bur this time make the person measure the height of the second bounce.
8. Have the person throw the ball back to you.
9. Repeat step seven to eight two more times.
10. Drop the ball at the same height again, but this time have the person measure the height of the third bounce.
11. Have the person throw the ball back to you
12. Repeat steps ten to eleven two more times.
13. Repeat steps four to twelve until you have done all of the balls.

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Independent variable: Size and materials of balls
Dependent variable: Bounce height
Controlled variable: Height of drop

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Ball one- Baseball
Ball two- Soccer ball
Ball three- Softball
Ball four- Kickball
Ball five- Nerf ball
Ball six- Tennis ball
Ball seven- Plastic ball

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It was interesting why the baseball bounced so high. It bounced about as high as the tennis ball! The Nerf ball, plastic ball, and soccer ball bounced about the same height. The Nerf ball, plastic ball, and softball were all the same size. They were also the same weight, except for the softball. It was a lot heavier.

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My hypothesis is that the smaller the ball and the lighter the material, the higher the ball will bounce. The kickball was the biggest ball and bounced the highest, but the tennis ball was the smallest and bounced the second highest. The softball was really heavy for it's size, and it bounced the least highest. My conclusions are that inflated balls bounced higher the non inflated ones

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-To Target, for selling the kickball and softball. The rest of the balls we already had.
-To the stairs to the new basement, in which at the bottom is a three foot square flat surface for the balls to land on.
-To my mom and my sister, for taking awesome pictures.
-And mostly, to my dad, for a unique style of measuring the height of the bounces without interfering them

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Exploratorium (?) "Why do balls bounce" Retrieved from the internet on May 17, 2017 Available at: https://www.exploratorium.edu Livestrong. (1997) "Why do balls bounce differently" retrieved from the internet on May 17, 2017 Available at: http://www.livestrong.com/
Reference. (1997) "Why does a ball bounce?" Retrieved from the internet at May 17, 2017 Available at: https://www.reference.com/
Van.physics.Illinois (2007) "Why do things bounce?" Retrieved from the internet on May 7, 2017 Available at: https://van.physics.illinois.edu/