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# The Bounce of a Ball

Extracts from this document...

Introduction

Hannah Jaques – Candidate 1068

Physics Coursework: The Bounce of a Ball

Introduction

There are many factors which will affect the bounce of a ball:

• The size and shape of the ball
• The material the ball is made from
• The surface it is bounced on
• The weight of the ball

For example, a ball dropped on sand would absorb more energy than a ball dropped on a concrete floor.

Aim

To investigate the bounce of a ball.

Prediction

I predict that when you decrease the height you release the ball from, the height the ball bounces back up to will remain the same. Therefore the ball height will be reduced by the same amount.

Apparatus

• Tennis Ball
• Table tennis ball
• Metre Stick
• Clamp
• Clamp Stand
• Concrete floor

Plan

• I intend to change the height and measure the change in cm.
• I will use the apparatus listed above to measure and carry out my investigation.
• I will change the height and measure the drop of the ball from at least 5 heights to obtain decent averages for my graph results.
• I will repeat each measurement 3 times to obtain reliable data.

Middle

10

10

TABLE TENNIS BALL

 Release height (cm) Attempt 1 (bounce back height in cm) Attempt 2 (cm) Attempt 3 (cm) Average (cm) 200 97 91 94 97 180 92 89 88 90 160 88 83 80 80 140 75 76 73 75 120 67 70 65 65 100 46 48 49 48 80 46 39 42 42 60 35 33 37 35 40 21 24 18 24 20 6 7 9 7

Safety and Fair Testing

• When tightening the clamp head, make sure fingers and other body parts are out of the way.
• The ruler is securely fixed to the clamp stand.
• The same person drops the ball and measures the ball bounce height.
• The ball is bounced at least 3 times from one height to ensure accurate, reliable results.

Constants

Data not changed during my experiment:

• Ball – a tennis ball
• The surface the ball is dropped on
• The person dropping the ball and the person measuring the bounce difference.

Method

1. Set up apparatus as shown in the diagram
2. Drop the ball from a height of 2m onto the floor.
3. Decrease the height by 20 cm each time until a height of 20 cm.

Conclusion

 Release height (cm) Attempt 1 (bounce back height in cm) Attempt 2 (cm) Attempt 3 (cm) 140 68 70 70 120 62 63 62

My investigation could have been more accurate in a few ways. Different apparatus, such as video recording equipment, could have been used to get the exact height or the ball bounce. Frames could have been frozen when the ball had reached the top of the rebound bounce to get the most accurate result.

The investigation could have been extended so that there were other variables other than the drop height. The surface that the ball was dropped on could have changed, the ball could have been changed, like in my preliminary investigation or the pressure applied when letting go of the ball could have changed. More force could have been applied.

This student written piece of work is one of many that can be found in our GCSE Height and Weight of Pupils and other Mayfield High School investigations section.

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