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# Bouncing balls experiment.

Extracts from this document...

Introduction

Tarik Saif 10 SN

Physics coursework: An investigation into how the height that a ball is dropped from influences the height of the bounce of different balls.

Plan

I am going to investigate how the height a ball is dropped from can affect the height of the bounce on impact with the ground. To broaden my investigation I will also change the type of ball used in order to evaluate the differences.

To ensure that my experiment will be carried out safely, everyone involved in the experiment will wear safety goggles at all stages of the experiment. The practical will be carried out in plenty of space, clear of bags and coats. It is also imperative to consider the safety of other pupils that may be close to the practical. Therefore no one who is not involved in the practical shall be allowed in close vicinity of the experiment. Great care will also be taken when dropping a ball to ensure that any ball does not strike others in the room.

The only dependent variable in this experiment is the height that the ball bounces, as this is not known or controlled prior to the experiment.

The independent variables in the experiment are the heights that the balls are dropped from, the surface that the ball bounces on, the type of ball used, ball is dropped vertically, and that when dropping a ball no force is applied.

Middle

22.6

0.6

32

33

34

33

33

33

0.8

39

37

38

38

39

38.2

1.0

46

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45

44

43

44.6

1.2

47

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48

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48

47.6

1.4

55

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53

1.6

54

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1.8

61

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2.0

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58.6

 Hockey ball 129➔0.129 0.2 9 9 10 9 10 9.4 0.4 17 16 17 17 17 16.8 0.6 26 27 27 26 27 26.6 0.8 32 31 33 32 32 32 1.0 36 36 37 36 37 36.5 1.2 42 44 41 43 41 42.2 1.4 46 47 48 46 48 47 1.6 53 55 54 54 56 54.4 1.8 57 56 55 56 58 56.4 2.0 59 59 60 61 59 59.6 Golf ball 44.6➔0.0446 0.2 12 13 13 12 14 12.8 0.4 20 22 23 22 23 22 0.6 39 38 38 38 37 38 0.8 48 48 49 50 49 48.8 1.0 57 57 58 59 59 58 1.2 80 79 76 76 79 78 1.4 83 89 87 82 85 85.2 1.6 102 101 99 104 104 102 1.8 108 109 112 117 115 112.2 2.0 117 121 124 122 125 122.8

## Analysis

From my results it is clear that the higher a ball is dropped from the greater the height of the bounce. The different heights of bounces not only depend on the height that the ball is dropped from but also the type of ball. Factors such as size, weight and material can greatly affect the height of the bounce. Here is the order of the highest bounce of a ball to the lowest:

1. Golf ball
2. Tennis ball
3. Ping-pong ball (table tennis)
4. Hockey
5. Air-flow

From the results, it is acceptable to say that there is a linear relationship between height of the bounce and height ball dropped from. This shows that the two terms are directly proportional to each other.

My prediction that the golf ball would bounce the highest was correct reaching an average maximum height of 122.8 cm, whereas the other

Conclusion

I could take this experiment further by using a different variety of balls that vary in size, and mass for example. I could extend this investigation by using different surfaces such as concrete and glass and see how the bounce is affected. Real surfaces are not perfectly hard. They distort when hit by a ball. They store energy themselves, and return some of it to the ball as it rebounds. Some surfaces, such as a trampoline, store energy very efficiently and return almost all of it to the rebounding object. Work out the time taken for each ball and compare the distance to the time taken for the ball to hit the surface, or the mass of the ball to the time taken. Or I could drop the balls in different areas that have different temperatures and see how this would affect the height of the bounce. I could use only one ball such as a tennis ball and compare how height it bounces to the height it is dropped from, and see if there is any relationship between the intervals and the maximum height they bounce. I could use on particular type of ball, such as golf balls, but use five of them and see how the mass of the ball can affect the height that it bounces. Such ideas could give more evidence, or extend my investigation in this subject field.

This student written piece of work is one of many that can be found in our GCSE Forces and Motion section.

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