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Stretching Rubber Bands

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Introduction

Stretching Rubber Bands Planning Aim We have studied the effect of a stretching force on a steel spring. We are now asked to investigate what extent rubber bands behave like steel springs. Design and carry out an experiment to test rubber bands for their elasticity. At least, two types of rubber band are available; although you may ask for more if we require them. Variables Dependent - stretching force Independent - extension Fixed - width of band, type of band I will be testing the extension of the band, by placing differing loads on it. The width and type of band will be kept the same by using the same rubber band throughout the experiment. This is to ensure a fair test. Prediction I predict that the rubber band will act very similar to the steel spring. I think that the predicted graph will look like this: - This graph is like this because the extension increases in proportion to the load, until point B. This is when the band has reached its elastic limit and snaps. Therefore the load it can take will be 0g. ...read more.

Middle

Loading (cm) Unloading (cm) 1 0.0 2.0 2 5.9 12.9 3 12.5 21.9 4 18.3 23.9 5 20.9 25.0 6 23.0 25.4 7 24.6 25.9 8 25.3 26.3 9 26.3 26.8 10 26.9 26.9 Extension Weight (N) Loading (cm) Unloading (cm) 1 0.0 2.9 2 5.2 12.6 3 11.5 22.0 4 16.7 23.2 5 21.6 24.1 6 23.6 25.1 7 24.5 26.0 8 25.4 26.6 9 26.2 26.9 10 27.1 27.1 Average Extension Weight (N) Loading (cm) Unloading (cm) 1 0.0 2.0 2 5.3 11.8 3 11.4 21.2 4 15.7 22.8 5 20.8 23.7 6 22.3 24.3 7 23.5 25.0 8 24.6 25.6 9 25.5 26.1 10 26.3 26.3 There are no anomalous results, all given results where used in calculating the average extension. Analysis My prediction was correct in the fact that the extension did increase as the load did, however, I was incorrect in saying that they would increase in proportion. This is not so, as we can see from the graph (it is a curve). This also means that my predicted graph is wrong, as I predicted a straight-line graph. I was unable to prove my point that the band would reach its elastic limit and snap, because the maximum load I was using (10N) ...read more.

Conclusion

In order to gain accurate results from this mirror method, you must make sure that the mirror is parallel with the ruler, otherwise the angle may be wrong. This is something I think I could improve on if I was to repeat the experiment. There were no anomalous results that I could pick out, so the procedure I carried out was quite good. Another thing I would change about that procedure, however, is the pin used as a pointer onto the ruler. I stuck it to the top of the weight holder with plaster scene. I felt this was not the best way of doing so and would use cello tape instead. This is because I would have been able to ensure that the pin was at a right angle to the ruler and the cello tape would have stopped the pin from moving which was impossible while using plaster scene. Testing another type of elastic band or investigating the same thing with a steel spring could have furthered the experiment, so that you could directly compare the results. Also, preliminary work to test elastic limits the bands' (or springs') would have given us better graphs, as I could have got a better curve. ...read more.

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