Hooke's Law Investigation. Essay

862 Words 4 Pages
Hooke's Law Investigation

Introduction -

Hooke's Law is when forces are applied to a solid object and it can result in extension or compression. Hooke's Law is able to predict how a spring (or other stretchable object) would behave when force is applied to it. I am trying to find out what factors effect the stretching of a spring.

The variables are:

Ÿ Downward force applied to spring.

Ÿ Spring material.

Ÿ Length of spring.

Ÿ No. of coils in spring.

Ÿ Diameter of spring material.

Ÿ Cross sectional area of spring.

I have chosen to look at the effect of the weight applied, as it is a continuous variation.

Predictions -

I predict that the
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I will then add weights to the spring and measure extension. Before deciding on the range of experimentation I carried out a preliminary test to find the elastic limit of the springs we had. To do this I added weights to the spring until it did not return to its original shape. This occurred at 12N and so I set a limit of weight to 10N for my experiments. The reason why 11N was not used is that 10 experiments is a more standard number and also that the limit of proportionality is slightly less than the elastic limit of the spring, therefore using 10N ensure I do not exceed the proportional or elastic limit of the spring. I also hope to carry out the experiment 3 times and also take an average to increase the reliability of my results. Due to the preliminary test no strict safety precautions need to be used, as the only potential danger would be if the spring snapped, however this will not happen if there is no more than the maximum load on the spring of 10N at any one time. This will also remove the problem of the stand on which the experiment is taking place from falling over.

Experiment Diagram -

The weights available are 1N masses and so I will take 10 extension measurements starting at 1N up to 10N of force on the spring.

Results Table -

Force in N Test 1 Test 2 Test 3 Average 1 33 31 35 33 2 71 75 70 72 3 114 112 115 113 4 150 148 146 148 5 185

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