How High a Ball Will Bounce

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Hypothesis: I predict that the tennis will bounce the highest on a cement surface then other surfaces because i think that cement is the most hardest surface

Background Information: When the ball comes in contact with the surface it will rebound the same amount of force hit on the ground back to the ball. Due to the gravitational pull the tennis ball will make it lose force and it will become weaker for every bounce.

Resources/Equipment: A surface, 30 cm ruler and a tennis ball Risk Assessment: Losing the ball: Do it in a enclosed area, The ball bouncing on an object and the surface having a uneven ground: Look for a good and safe spot to do it

Variables:
Independent Variables: The wind.
Controlled Variables: How big the ball is, The surface of the ground, how I drop the ball Dependant Variables: Where the wind blows the ball.

Method:
1. Get a 30 cm ruler and drop the ball from the top of the ruler on to the selected surface. 2. Measure how high it goes.
3. Repeat the steps on a different surface

Results:
Wood: 15Cms
Plastic: 10Cms
Cushion: 11Cms
Concrete: 17Cms
Discussion: The one that gave the least push reaction was the plastic I think it's because plastic has a soft but solid surface. The cushion one was the almost the same as the plastic but it is all soft but it bounced slightly higher I think because of the fact that cushion automatically rebounds force applied to it supporting the push of the bounce. The wood bounced the second highest because it is pretty hard and it barely moves when hit it just stays this gives the ball a harder push back up. The concrete bounced the highest because it is the hardest surface I've tried.

Conclusion: In conclusion the cement surface allowed the ball to bounce the highest.

Improvements:
Use a meter ruler to get a more accurate measure of the bounce. Try bouncing the ball on a different surface.
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