# In this experiment I will investigate whether a rubber ball when dropped from descending heights affects the height at which it bounces up to.

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Introduction

Maryam Shah

Set 4

Bouncy Ball Experiment

PLAN

Aim

In this experiment I will investigate whether a rubber ball when dropped from descending heights affects the height at which it bounces up to.

Method

EQUIPMENT

- RUBBER BALL
- METER RULER- Measure the height of which the rubber ball is dropped from and where it bounces up to.
- CLAMP STAND- Hold the ruler upright.

PROCEDURE

I will clamp a meter ruler upright on a stand. A rubber ball will be dropped from 100 cm 3 times. The results will be recorded and then the average will be found adding the 3 results does this and then dividing this sum by 3, the average is needed so the results will be more reliable. The ball will then be dropped from a height of 90cm, 80cm, 70cm and so on until the final drop of 10cm. Each time the ball will be dropped 3 times, the results recorded and average found. When it comes to the experiment when the ball bounces on the wooden bench I will look to the height on the ruler, which it bounces up to, The measurement at the bottom of the ball.

DIAGRAM

The following is a diagram, which shows how the equipment will be set out.

FAIR TEST

Different factors may affect the results gained from the experiment to get the most accurate set of results I must consider the following points,

- The bottom of the ball should be dropped in line with the specific height. E.g.

- When the ball bounces back up the height inline with the bottom of the ball should be recorded every time.
- I must do the whole investigation at the same time so the ruler is always at the same point and so room temperature is constant.
- The surface must always be the same.

Middle

70 cm

35

37

36

35

36

37

36

60 cm

30

29

28

30

29

31

30

50 cm

26

25

27

26

28

25

26

40 cm

23

22

20

22

21

22

22

30 cm

15

14

15

15

14

15

15

20 cm

8

9

7

11

10

11

9

10 cm

4

3

4

4

5

5

4

I am able to see a pattern between the height the ball is dropped and the bounce back height. The height the ball bounces back to is approximately half of the height it is dropped from.

Analysis

I am also able to work out the Gravitational Potential Energy (GPE) the ball gains when lifted to each height, with the use of the following Formula, GPE=MGH, which was discussed earlier in the investigation. The mass of the ball is 0.1114Kg (114.4g) the Gravitational figure is 10N/kg. The information will be displayed in a table format.

By calculating the GPE of the Ball bounced back we will be able to calculate the efficiency of the ball, depending on the out come we will be able to have a rough idea of how much thermal energy and sound energy

Conclusion

By calculating the GPE of the balls I investigated I was able to prove that my prediction was correct. By observing the table containing the GPE of the balls at the descending heights we can see that the higher the ball was raised the more GPE it had and so bounced back to a greater height.

The experiment I carried out wasn’t exact and by observing the results and the graph we can see this, we are able to see some anomalous results. This is probably due to my sight it is difficult to see the exact height the ball bounces back up to, that’s why I decided to find the mean average of 6 experiments. If I did more experiments I would be able to pinpoint a more accurate efficiency mark, which should be about 50%. One way of doing this is by placing light gates, which are linked up to a computer they would record the exact height of the ‘Bounce Back’ and would thus lead to accurate results.

The surface the ball was dropped on was wood, it was very uneven and so also affected the height the ball bounced back to, if the surface was totally flat the results would also be more accurate.

If I were to also investigate the ‘bounce back’ heights from when the ball is dropped on different surfaces I would be able to gain a more accurate conclusion.

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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