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Prove if Hookes Law's theory of extension is proportional to length is true.

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Suganthan Shanmugaratnam

Physics Coursework



The aim of this coursework is to prove if Hookes Law’s theory of extension is proportional to length is true.

Scientific Knowledge:

Robert Hooke investigated springs nearly 30 years ago. He found that the extension was proportional to the stretching force so long as the spring was not permanently stretched. This means that doubling the force doubles the extension, trebling the force trebles the extension and so on. Using the sign for proportionality we can say write Hookes Law as: EXTENSION IS PROPORTIONAL TO STRETCHING FORCE.


I predict that the extension will be proportional to the stretching force so long as the string is not permanently stretched. This means that the results should be near enough consistent while increasing in the extension until I reach the end of the experiment.

Safety Precautions:

I am going to make my experiment safe by wearing safety goggles, just incase the spring breaks and bounces back to my eye.

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Results table:

MASS (g)






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All of my results seemed to be very accurate. They all followed a pattern, but if I was to do it again, I would like to get to elastic point of the spring.

The only problem is that some of the measurements could have been slightly inaccurate because I was using a 30cm ruler, and maybe that spring had not fully stopped. If there were a chance to do the experiment again, I would wait longer so there’s more chance for the spring to stop.

Also to make sure that all my results were accurate I would have to dedicate more time to the experiment and be able to repeat them again.

There are many different interpretations I could of used in this experiment such as changing the length of the spring, the material of the spring or the thickness of the spring. This could all have a major effect on the final outcome of the results.                              

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