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# I am investigating the relationship between extension and load, therefore testing Hooke's Law.

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Introduction

Investigating Hooke's Law The Aim I am investigating the relationship between extension and load, therefore testing Hooke's Law. 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. There are several factors that could effect the stretching of a spring: � Downward force applied to spring. � Spring material. � Length of spring. � No. of coils in spring. � Diameter of spring material. � Cross sectional area of spring. I have chosen to investigate the downward force on the spring because it is a continuous variable. Prediction I predict that the bigger the weight applied to the spring, the further the spring will stretch. The reason for this assumption is based in Hooke's Law which states that extension is proportional to load. If load increases so does extension and stretching distance. Extension = New length - Original length To see if my prediction is correct, I will run an experiment to obtain results based on the equation reported above. ...read more.

Middle

Choosing The Right Equipment To Use Spring 1: A slinky is very difficult to measure in this type of experiment. The problem is that it will drop down as soon as force is applied to it. Spring 2: This spring is not suitable because it is too long and over stretches when minimal force is applied to it. Spring 3: This spring is not suitable because it is too strong and cannot be extended easily. Even with weights on it, it still made a very small reaction. Spring 4: This spring was too weak and too small to be suitable for use in this experiment. If weight had been applied the spring would have fallen and broke. Spring 5: This spring was suitable for the experiment because it was fairly strong, could hold a large amount of weight without reaching it's elastic limit and would also return to its stationary position after a force was applied. Spring 6: This spring was not suitable because it was a 'Compression Spring' and would have to be compressed in order to be used properly. ...read more.

Conclusion

The results from this experiment support Hooke's Law. Evaluation Overall, the experiment was very successful in my opinion. I obtained a large quantity of very accurate and reliable results from which I was able to create informative graphs. As can be seen from graph 1, the line of best fit shows that Hooke's Law is true. In other words increasing weight has a direct effect on extension. In this experiment I didn't come across any anomalous results. This maybe because precautions were taken to make the test as fair as possible. Although the results were reliable there were a few factors that could have affected the results: Human Error: The measuring of the length using a ruler could have been incorrectly taken if the measurer's eye level was not directly looking at the point of extension. Elastic Limit: After the spring was extended, it would not go back into its original shape. This could have affected the results because an extra length would have been added to the spring making the results less accurate. Recoil: After a weight was applied to the spring, the spring would recoil and so it would be hard to measure the exact length of extension. Erden Raman Physics 11Physics 11M ...read more.

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