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Hooke's Law

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Introduction

Hooke's Law Introduction: I am trying to find out what factors effect the stretching of a spring. Factors which might affect the spring are: � Downward force applied to spring. � Spring material. � Length of spring. � No. of coils in spring. � Diameter of spring material. � Cross sectional area of spring. I have chosen to look at the effect of the weight applied, as it is a continuous variation. Prediction: I predict that the more weight applied to the spring, the further the spring will extend. This is because when the load increases so does extension and stretching distance. to find out how much something has been extended there is a little formula: New size - Original size. To prove that my prediction is correct I will experiment, and collect results using Hookes Law. He found that extension is proportional to the downward force acting on the spring. Hookes Law F= ke F = Force in Newtons k = Spring constant e = Extension in Meters Equipment list: Boss clamp 1 metre rule 3 springs (different sizes) ...read more.

Middle

This occurred at 12N and so I set a limit of weight to 10N for my experiments. I also hope to carry out the experiment 3 times and also take an average to increase the accuracy of my results. Because I did a practice test no strict safety precautions need to be used, as the only potential danger would be if the spring snapped, this is unlikely to happen if there is no more than the maximum load on the spring. This will stop the stand from falling. Experiment Diagram: The weights ill be using are 1N masses and so I will take 10 weights to reach my maximum load, starting at 1N up to 10N of force on the spring. Results Table: Test1 Amount of Weight (N) Spring Length (mm) 1 33 2 71 3 114 4 150 5 185 6 215 7 250 8 280 9 320 10 355 Test 2 Amount of Weight (N) Spring Length (mm) 1 31 2 75 3 112 4 148 5 183 6 214 7 249 8 280 9 310 10 350 Test 3 Amount of Weight (N) ...read more.

Conclusion

In the Hookes Law test there were no significant irregular results. In terms of reliability the Hookes Law experiment was carried out 3 times then an average was taken and all results were very close together. However it occurred to me as the extension increased the difference between results was slightly rising this could be as the spring was nearing its limits. This shows that my results for this test support Hookes Law, which also proves my prediction to be correct. The practice test, which I had carried out also, helped in this area as if the elastic limit had been included in my results they would have been inaccurate for taking an average result. The tests also helped with any safety concerns, as there was very little danger of the springs breaking if the elastic limit was not reached. I am pleased with my results and feel they reflect each other as well as the laws they were based on. If I was to perform the experiment again changes could be made to collect the results more accurately. If the measurements were to be taken even more accurately, or the rule was set at the perfect upright position. ...read more.

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