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How much will a Elastic band stretch after adding weights?

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Introduction

Jamie Moir 11F21 March 2002

How much will a Elastic band stretch after adding weights.

Prediction

I predict that the more weight added to the elastic band the more it will extend. The reason it extends is because it is elasticised. If I add too much weight it will reach its elastic limit. After that it will not extend and will become plastic. When I take the weights off I think the elastic band will relax to a size slightly bigger then it’s original state. We did a similar experiment with springs instead of an elastic band. The more weight added the longer the spring extended.

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Middle

13cm

1.5cm

200g

15cm

3.5cm

300g

20cm

8.5cm

400g

23.5cm

11cm

500g

30cm

18cm

600g

36cm

25cm

700g

41cm

29.5cm

800g

46.5cm

35cm

900g

49cm

37.5cm

1000g

52cm

40.5cm

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Conclusion

">

900g

63cm

51.5cm

800g

63cm

51.5cm

700g

59cm

47.5cm

600g

58cm

46.5cm

500g

48cm

36.5cm

400g

30cm

18.5cm

300g

23cm

11.5cm

200g

15cm

3.5cm

100g

15cm

3.5cm

0g

13cm

1.5cm

The starting length is 11.5cm. Once all the weights have been put on, and then taken off the end size is 13 cm. That is an increase of 1.5cm.

Conclusion

My prediction was correct, the more weight I added the more the elastic band extended. And when I took the weights off the elastic band relaxed to a state slightly bigger then its original size. An increase of 1.5cm. Due to having foreknowledge of Hooke’s law made it easy to roughly predict what the results were going to be.

...read more.

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