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Investigation to show how Elastic Bands Behave Under Load.

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Introduction

Investigation to show how Elastic Bands Behave Under Load

Prediction  

The aim of the investigation is to determine how elastic bands behave under load. Before I begin the investigation I will carry out a preliminary experiment into the behaviour of a spring, which I believe will not act in the same way as the elastic band.

  In the preliminary investigation a spring was put under load and the results were as follows:

Load/g

Length/cm        

Extension/cm

0

2.2        

0

100

11.0

8.8

200

13.1

10.9

300

15.3

13.1

400

17.2

15.0

500

21.1

18.9

600

24.6

22.4

700

29.0

26.8

800

34.3

32.1

900

88.5

36.3

1000

42.0

39.8

1100

46.6

44.4

1200

1300

1400

   From previous knowledge of Hooke's Law, which explains, extension is proportional to load until elastic limit is reached. The preliminary experiment with the spring shows, that they obey Hooke's Law up until the point of permanent deformation (elastic limit).

   I think that the thinner rubber band will have a bigger extension than the thicker band and the longer band will have bigger extension than the shorter band.

  I think the longer rubber band will have the biggest extension because the molecules within the rubber band are larger and are less intertwined and the molecules are therefore stretched further causing it to have a greater extension. Although the band is stretched the rubber band does not obey Hooke's Law. The elastic band will regain its initial shape and it behaves elastically.

...read more.

Middle

500

42.7

34.3

600

46.4

38.0

700

47.6

39.2

800

48.8

40.4

900

51.7

43.3

1000

52.3

43.9

  1. Longer Band

Length = 14.3 cm

Width  = 1 mm

Load/g

Length/cm

Extension/cm

0

14.3

0

100

22.0

7.7

200

35.4

21.1

300

50.3

36.0

400

55.9

41.6

500

64.7

50.4

600

70.8

56.5

700

74.9

60.6

800

78.9

64.6

900

82.3

68.0

1000

84.8

70.5

We repeated our results on this band.

Load/g

Length/cm

Extension/cm

0

15.2

0

100

25.3

10.1

200

42.4

27.2

300

60.6

45.4

400

72.1

56.9

500

77.6

62.4

600

83.7

68.5

700

86.4

71.2

800

89.1

73.9

900

89.9

74.7

1000

94.4

79.2

Changing the width, keeping length the same.

  1. Thicker Band

Length = 6.7 cm

Width = 1 mm

Load/g

Length/cm

Extension/cm

0

6.7

0

100

10.5

3.8

200

12.9

6.2

300

15.7

9.0

400

19.6

12.9

500

23.8

17.1

600

29.1

22.4

700

32.2

25.5

800

35.9

29.2

900

38.5

31.8

1000

43.0

36.3

...read more.

Conclusion

  The conclusions I have made are true for all elastic bands I measured. I would have to experiment further with different elastic bands to prove that my conclusions were true. I couldn’t say for sure what would happen to other elastic bands of different lengths and widths, as it would have to be investigated further. I also could measure an elastic band to a certain length or width to see if my conclusions are true.

  If I were to do the experiment again I would look at other materials to stretch such as copper, steel, rubber etc to see if any other materials obey Hooke’s Law. I could again look at different lengths and widths of other elastic bands.

  I would also use accurate measuring equipment so that no errors occur and good, clear accurate results are obtained. The good results would present a clear idea of how elastic bands behave under load. Further experiments could be carried out, using different equipment to see if my conclusions are true that elastic bands do not obey Hooke’s Law.

...read more.

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