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To investigate the stretching of an elastic band when it has some load on it.

Extracts from this document...

Introduction

Saira HamidPhysics course work

11cmElastic Band

Investigation:

To investigate the stretching of an elastic band when it has some load on it.

Aim:

To find out how much load is needed for the elastic band to reach its elasticity limit.

Introduction:

By using an elastic band and some weights, I am going to find out how much weight in grams it takes the elastic band to reach its full elasticity limit before it snaps.

Background:

Hooke’s law of elasticity states that for relatively small deformations of an object the displacement or size of the deformation is directly proportional to the deforming force or load.

        At relatively large values of applied force, the deformation of the elastic material is often larger than expected on the basis of Hooke’s law, even though the material remains its elasticity and returns to its original shape and size when the load is taken off.

        Elasticity is the ability of a deformed material body to return to its original shape and size when the forces causing the elastic band to stretch are removed.  Most solids exhibit elastic behaviour.  This limit is called the elastic limit; this is when the elastic band has reached the maximum elasticity before it snaps.

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Middle

Maintaining accuracy:

I think that the accuracy of the experiment was maintained very well and I did this by:

  1. Making sure that the ruler is vertical with the elastic band.
  2. Reading the measurements at eye level.
  3. Taking readings more than once and then tallying up the average.
  4. Not taking the elastic band beyond its limit.

Results for Experiment 1.

LOAD (g)

LENGTH (cm)

EXTENSION (cm)

0

14

0

40

16

2

80

18

4

120

21

7

160

25

11

200

31

17

240

36

22

280

42

28

320

50

36

360

53

39

400

57

43

440

60

46

480

63

49

520

70

56

560

73

56

600

75

59

640

77

61

680

79

63

720

80

65

760

80

66

800

80

66

840

80

66

880

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Conclusion

And last of all it could have been because we didn’t finish the experiment in one lesson so we had to do it in several lessons. So during this period the equipment could have been used and moved around, this could affect the way the experiment is carried out.

The accuracy in number 5 could be improved by working a lot quicker and trying to get the experiment complete in the lesson or if not perhaps labelling the equipment is a good idea so that you can use the same equipment and recognize which set of apparatus you used last time.

        If I were to change my experiment I would compare the elastic band with a spring and see the difference at the end. This would extend the investigation further because not only would I be investigating the elastic band, I would also be investigating the spring. Also with this investigation I would have to do further research on springs.

        But then again if I was to do this same investigation again I would try and improve the accuracy of the results by repeating the experiment a third time and concentrate more on making it a fair test.

        Overall I was very pleased with the out come of my investigation, but the points made above could improve it.

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