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• Level: GCSE
• Subject: Maths
• Word count: 1645

# Squash ball Investigation

Extracts from this document...

Introduction

Squash ball Investigation

Aim

The aim of my investigation is to investigate the factors which affect the bounce height of a squash ball.

## Factors I could investigate

1. Surface
2. Height
3. Weight of ball
4. Types of ball (dot colour)
5. Temperature of ball

## Chosen variable

I have chosen to change the height that I drop the squash ball from, as the other possible variables would be unsuitable for our investigation.

Changing the hardness of the surface would be difficult to do, as it is hard to measure the hardness of the surface.

Changing the weight of the ball would be difficult, as you can’t accurately change the weight of the ball manually unless you buy different weight balls, and we don’t have enough time to do it.

The types of ball would be complicated to record, as you would be looking the dot colour and this would be hard to do in our situation (with not enough squash balls to go around.)

The temperature would be difficult to change as there aren’t enough water baths in the classroom and as the temperature would have to go up quite high there is also a safety hazard.

Therefore, changing the height the ball is dropped from is the easiest and best option to choose.

## Prediction

I predict that when you have a higher drop height, the ball will bounce higher.

## Reason for Prediction

Middle

6

Average

0.10

2

2

1

1

1

-

1.40

0.20

5

3

4

5

5

-

4.40

0.30

7

8

7

8

4

8

7.60

0.40

10

9

10

10

8

-

9.40

0.50

12

12

12

12

11

-

11.80

0.60

14

13

14

13

12

-

13.20

0.70

23

20

19

16

20

18

20.00

0.80

24

23

22

23

24

-

23.20

0.90

25

24

25

25

24

-

24.60

1.00

31

29

33

29

30

-

30.40

= Anomalous result (repeat in column 6)

### Conclusion

My evidence shows me that the higher I dropped the ball from, the higher it bounced.

The trend (pattern) shown by my graph is that as the drop height is doubled, the bounce height is approximately doubled as well. For instance, when the drop height is 0.20m, the average bounce height is 4.40cm, and when the drop height is 0.40m, the average bounce height is 9.40cm.

Conclusion

The reasons that the repeats are not all identical are we might have made mistakes when reading the bounce height. It was very hard to do as the bounce was fast and you had to be really concentrating and accurate when you were reading off the heights.

The largest range bars are for the drop heights of 0.70m (where the range is 5cm), and 1m (where the range is 4cm.)

To make this practical method more reliable, you could repeat the bounces 10 times for each drop height (instead of 5). We could also video it to check the bounce heights, make the room 40°C to keep the ball temperature constant (controlled environment).

The strange (anomalous) results might have happened because we couldn’t read the bounce height when it was too close to the surface. Or because the ball cooled down over usage, the water bath could have also cooled down. To avoid this we could stir the bath more often and leave the squash ball in the water long enough to heat up.

Extra practical work I could do to back up my conclusion would be to use the video camera method, to do more repeats, do the experiment with a different types of squash ball, to do the experiment over a different range of drop heights (1-2m), and to compare the efficiency with different types of sports balls (golf, tennis, etc).

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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