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# To see how the distance, a weighted margarine tub travels, changes as the distance the elastic band, which fires it, is pulled back further.

Extracts from this document...

Introduction

Mr Tubby

Plan

## Aim

To see how the distance, a weighted margarine tub travels, changes as the distance the elastic band, which fires it, is pulled back further.

## Equipment

• Elastic Band
• Weights
• Margarine Tub
• Graph Paper
• Stool
• Table
• Ruler
• Set Square
• Selotape

## Method

After the equipment is set up, I will put 200g of weights (two 100g weights) in the margarine tub. I will then pull the tub backwards against the elastic band so the back of the tub is at the right distance. These distances will start at 2cm then go up in 2cm until 20cm.

Using the graph paper I will pull back the tub, against the elastic band, to the right distance (using the lines to make sure the tub is straight). I will then release the tub, letting it get propelled forward by the elastic band. When the tub stops moving, I will measure the distance it has travelled (not just from the end of the graph paper, but from where the back of the tub originally was) using the metre rule and a setsquare to make it more accurate.

Once I have recorded the measurement, I will repeat the same distance that it was pulled back two more times. Then I will move on to the next distance and do that three times, and so on. Until I have done the experiment three times for each distance pulled back. With these I can then calculate an average for each distance pulled back.

## Fair Test

Middle

Attempt 3 (cm)

Average (cm)

4cm

5.2

6.6

6.4

6.1

5cm

10

10

8.6

9.5

6cm

12.8

13.5

13.7

13.3

7cm

16.6

14.8

17.4

16.3

8cm

17.6

18.8

19.1

18.5

9cm

23.2

22.3

23.1

22.9

10cm

25.7

28.7

28.8

27.7

11cm

34.3

30.4

35.5

33.4

12cm

40

37.5

45

40.8

Analysis

My graph shows me that as the elastic band was pulled back further and further, the further the tub travelled.

This can clearly been seen by the way the results curve upwards steeper and steeper. Meaning that the each time the tub was pulled back further, it didn’t just increase in distance the same amount each time, otherwise it would of produced a straight diagonal line going up. Instead it gains in distance from the previous result by a bit more each distance pulled back, creating the upwards curve on the graph.

This happens because energy from me transfers to the elastic band, by me pulling the tub back against it. The potential energy in the elastic band is then released as kinetic energy when I let go of it, giving the tub kinetic energy moving it forward. Meaning the more work done by me, the bigger the force on the tub from the elastic band. Which then means the distance the tub travels increases.

In my prediction I thought that:

As the force on the tub increases, the speed will increase quicker, meaning the distance the tub travels further each time, increases more.

After doing the experiment I now know this is correct and that the predicted shape of the graph I drew, is also correct.

Conclusion

Once I have done this I will repeat it all again, but instead of 50g in the tub, I will change it to 100g, then 150g, then 200g, adding 50g each time until the weights in the tub equals 500g.

## Fair Test

To make the investigation a fair test, I will not change these things:

• Surface
• Margarine Tub
• Distance pulled back
• Elastic Band

The only thing that I will change is the amount of weights in the margarine tub.

Key Variables

The things that could affect my experiment are:

• The Surface (friction on different parts of the table)
• The position I pull the tub against the elastic band.

To try and control these things I will try to put the tub in the same position on the elastic band and keep the experiment on the same desk. Although this doesn’t control the things very well, it is the best that can be done in the classroom.

Prediction

I expect that as the weight inside the tub increases, the distance the tub travels will get less and less.

I think that this will happen because the friction between the table and the bottom of the tub will increase, as the mass of the tub increases. As this friction increases it means that to move the tub as far as the previous go, the tub will have to be pulled back further against the elastic band. But as the distance pulled back is kept the same, it means the tub wont travel as far as the previous go.

So the graph of results should look something like this:

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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