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Elastic Band Investigation.

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Introduction

Elastic Band Investigation The things that might affect this are: - Downward force applied to the elastic band - Length of elastic band - Thickness of band - Band material My prediction for this experiment is that I think that the more force you exert on the elastic band then the longer its length will be. This is because extension is proportional to load and so if the load increases so does the extension and so does the stretching distance. Shown on a graph, I think it will look like this: This shows that as the force (f) gets bigger, then the extension (x) will also get bigger. Higher values represent stronger, less stretchy bands, and lower values represent weaker, easier to stretch bands. I have done some research and found that this experiment is based on 'Hooke's Law' Hooke's law is when you stretch or compress an object and they change shape, for some elastic materials a steady change in force produces a steady change in shape. Another way of saying this is that if you apply a force to a spring, the spring will stretch by some length. Double the force, double the stretch, and so on. ...read more.

Middle

We will carry out the experiment 3 times, the first and second being us measuring the length as the weights are put on, and the third us measuring the length as the weights are being taken off to see if there is a difference in the length when it is taken off and when it is being put on. We will also take an average. However, I will not use the third experiment in my average. As far as safety precautions go, we will wear safety goggles, just in case the elastic band does snap, which will be highly unlikely, due to the first experiment we did to find out the elastic limit. But, we will also use something to hold the clamp in place, so it doesn't fall over. Experiment diagram The weights we had were 10N each, so I have started off with 10N and finished with 200N. Results table Force in N Test 1 Test 2 Test 3 Average 0 10 9 9.8 9.5 10 11.5 9.6 11.5 10.55 20 14.4 11 13.6 12.7 30 20.3 12 16.1 16.15 40 25 13.8 20 19.4 50 29.7 16 22 22.85 60 31.8 18.2 25.7 25 70 34.5 20.3 29.3 27.4 80 36 22 34.9 29 90 37.5 23.8 36.5 30.65 100 38.5 ...read more.

Conclusion

However, it appeared that as the extension increased the difference between the two results decreased slightly. The reason could be that the elastic band was nearing its limit of proportionality. This shows that my results for this experiment support Hooke's Law, which proves the prediction to be correct. The first experiment to find the elastic limit for the elastic band helped with the safety precautions. There was very little danger that the elastic band would snap if the elastic limit was not reached. In conclusion the results supported each other as well as the laws they were based on. If the experiment were to be repeated, then I would make some changes in the way it was carried it out to reduce experimental error. * In both tests it would have been preferable to hold the ruler in place by using a boss clamp instead of holding it. This would ensure more accurate results by removing human error. * I would have used a pointer on the elastic band that would also help me gather the information more accurately, this would help by pointing to the measurement instead of us having to bend down and look. By undertaking the experiment again I could ensure that the results were accurate which would mean that the averages were more reliable. ...read more.

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