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The aim of my investigation is to see how each spring has been affected each time you add on a 100g on a spring.

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By Emmet Murphy 11K

Hooke’s law


The aim of my investigation is to see how each spring has been affected each time you add on a 100g on a spring.


In this investigation the following safety rules were applied:

  • Long hair was tied back to prevent it from getting in the way.
  • People were not cramped together as they needed room to work.
  • Goggles were worn to prevent eyes from getting damaged.
  • People could not play with equipment.
  • People could not run around in the science laboratory.
  • Desks were cleared.

There were not to many strict safety precautions used, as the only potential danger was if the spring snapped.


My method of experimentation will be to use a clamp stand and boss clamp to suspend a spring from. A second boss clamp will hold in place a metre rule starting from the bottom of the spring to measure extension in cm.

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Steel spring


Ruler reading

Pin used as pointer

Force applied

Measure then add on weight

7 WEIGHTS 100g each


My prediction is that each time you add on a 100g weight on a steel spring that the spring will be extended.

Adding on weights to a spring will change the length of the spring. This is because there is a limit to what the spring can hold and also sometimes the spring cannot go exactly to its usual form.

The spring would not stretch the same amount each time a new weight is added because more weight and force is pushing down spring each time you add a weight.

I am going to produce precise and reliable evidence by recording my results in a table and plotting a graph. I also hope to carry out the experiment 3 times and take an average to increase the reliability of my results.


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I am happy with the method I used and I think it was a precise and simple way of finding my objective. I found my results accurate as they followed a general pattern (increasing in the same amount). I found few results misleading as the results increased in larger amounts, but that might have been in view of the fact they were approaching the elastic limit.

I consider my results good enough evidence to support my conclusion as most of them followed a steady pattern and showed that if you stretch something with a steadily increasing force, then the length will increase steadily too. Some of my results were anomalous as when they were approaching the elastic limit the results started increasing in different amounts.  

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