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Elastic Assessment

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Elastic Assessment

The pulling force, which is applied, is called stretch.

When you stretch a spring the difference between the stretched and the unstretched spring is called extension.

In this experiment, I am going to investigate how the extension of a spring, depends on the pulling force applied to the material. My results show me that the extension of the spring is directly proportional to the force applied. Therefore when the force is doubled, the extension is also doubled. My experiment shows the characteristics of Hookes Law. Materials are said to obey Hookes Law, if their extension is directly proportional to the stretching force.

Hookes Law applies to many different materials such as wood, metal and glass, extension on these materials however is too small to be measured, nearly all materials infact are elastic- they return back to their original shape when the force is removed.

If force is continued to be added to a material, then we find that it reaches a point called it elastic limit.

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  1. Set up experiment as shown in the diagram.
  1. Measure the length of the elastic
  1. Add the force of one Newton
  1. Measure the length of the elastic now
  1. Continue steps 3-4 adding one extra Newton each time
  1. Repeat the experiment 3 times for a fair test.
  • 1 Newton is equal to 100grams
  • Measure using a millimetre ruler

Analysis and Conclusion:

My results show me that as you increase the force, the extension also increases.

The graph is also curved and slightly “S” shaped which shows that it doesn’t obey Hookes Law. Hooke’s law states that if you double the force,

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I would also repeat the experiment more than 3 times and work out an average of the three to give a more reliable even though my results were reliable enough to prove my prediction.

If I were to repeat this experiment, I would go beyond 10N and would be very interested to see what the results of that experiment would be and to see whether any major changes have occurred in my prediction and results.

We used corded elastic in this experiment, again, I could make a change if I were to re-conduct this experiment and use a rubber band instead of the corded elastic.

I feel that because of all of these factors noted above, my experiment was not a fair test, although I feel that it was reliable enough to prove my prediction correct.  

By Sanjay Virdi- 11BG/CM

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