Bouncing Balls.

Bouncing Balls

Aim:
I want to find out if there is a relationship between how high a ball is dropped from and how high it bounces up.

Hypothesis:

I believe that the concrete ground will make the ball bounce higher, than if it was on carpet.

Method:
The equipment that I will need is:

• Bouncy ball
• Ruler
• Stand with boss head and clamp

1. Attach the clamp to the stand.
2. Clamp the ruler onto the stand so that the zero mark is on the ground.
3. Hold the bottom of the ball on 50cm and drop.
4. Record the height of the bounce measuring the bottom of the ball.
5. Repeat the experiment twice more and record the average measurement.
6. Repeat the whole experiment using heights of 60cm, 70cm, 80cm, 90cm, 100cm

                                   
Variables:

Independent (changing) Variable = The height of the drop
Dependent (measured) Variable = The height of the bounce

Results:

Carpet:

Height of Drop	Height of Bounce
80cm	33cm
90cm	34cm
100m	34cm

Concrete:

Height of Drop	Height of Bounce
80cm	40cm
90cm	43cm
1m	51cm

Findings:

• 80 cm - Concrete: 40cm. Carpet: 33cm.
• 90cm - Concrete: 43. Carpet: 34.
• 1m - Concrete: 51cm. Carpet: 34cm. 

Discussion: I think the wind might've affected some of the drop heights.

Conclusion: I think concrete is more dense, and that made the ball bounce higher.                            Concrete is also much harder than carpet, and flatter, creating friction.

Evaluation: Concrete had an effect on the ball's bounce height.