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My aim for this experiment is to verify Hooke's law, which is F = MX.

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Introduction

Proving Hooke's law Aim My aim for this experiment is to verify Hooke's law, which is F = MX. Prediction I predict that the length will increase in relationship with the increase in mass. F = MX M = 1.5 X (cm) 2 4 6 8 10 F (n) 3 6 9 12 15 See prediction graph. Method The apparatus was set up as shown. We measured the length of the spring, using a ruler, every time we added mass to it and recorded the results. Safety Normal laboratory safety conditions apply. We wore goggles throughout this experiment to protect our eyes from snapping elastic bands. Results Spring We measured the spring before we started to add mass and it was 4.7cm in length. ...read more.

Middle

I then proceeded to hang a mass from the spring, starting with 0.1n and then added an extra 0.1n each time until we reached 0.6n, I then made the mass up to 1n and then 1.5n measuring the extension each time with a ruler. After recording my results in a table worked out by dividing 'f' by 'x' what 'm' would be for each result. In this experiment the results for 'm' were very close and although some were the same not all were. Elastic band This time I used an elastic band to text Hooke's law. I hung the elastic band from a retort stand and measured its length, which was 8.5cm. I then went on to hang a 1n mass from the elastic band and recorded the extension with a ruler. ...read more.

Conclusion

One error that could have been overcome was that of accuracy when measuring the extensions in either experiment, whereby I could have used pointers at the top and bottom of the spring/elastic band to get a more accurate measurement when lining the ruler up. The ruler that I used had an accuracy of 1/10th cm therefore we could only get a measurement to the closest mm. We could have used many things, other than an elastic band and a spring, to do this experiment on such as spider's silk, carbon fibre, steel piano wire or mild steel. If my results had been accurate and 'm' had been constant throughout each test I could have used 'm' to calculate other possible results, but because my results didn't match my prediction you could use the line of best fit in either graph to calculate further results. Kristy Kish ...read more.

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