How much will a Elastic band stretch after adding weights?

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Jamie Moir 11F                                                                21 March 2002

How much will a Elastic band stretch after adding weights.

Prediction

 I predict that the more weight added to the elastic band the more it will extend. The reason it extends is because it is elasticised. If I add too much weight it will reach its elastic limit. After that it will not extend and will become plastic. When I take the weights off I think the elastic band will relax to a size slightly bigger then it’s original state. We did a similar experiment with springs instead of an elastic band. The more weight added the longer the spring extended. I have also taken into account Hooke’s law. Hooke’s law simply states that the extension of a spring (Or other stretch object) is directly proportional to the force acting on it. This law is only true if the elastic limit of the object has not yet been reached.

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Plan

First I will attach an elastic band to a clamp-stand and will suspend the elastic band over the end of a table. I will then add a 100g (1 Newton) weight to the elastic band. I will then measure the elastic band and record the size. I will then repeat  this with a 200g (2 Newtons) weight. I will repeat the experiment for every 100g up to 1000g.(10 Newtons or 1 kilogram) I will then do the same but instead of adding weights I will take weights off.

Fair Test

To make sure that this is ...

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