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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.
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.
To make sure that this is a fair test I will use the same elastic band for putting weights on as for taking the weights off.
I have to make sure that the elastic band doesn’t reach it’s elastic limit. If this happens I will have to repeat the experiment.
List of Apparatus
* A test tube
* A Bunsen Burner
* A pair of tongs
* Copper Carbonate
* Something that will not burn if hot Copper oxide is poured on it
Diagram of Apparatus
Length of elastic band
Taking weights off
Length of elastic band
The starting length is 11.5cm. Once all the weights have been put on, and then taken off the end size is 13 cm. That is an increase of 1.5cm.
My prediction was correct, the more weight I added the more the elastic band extended. And when I took the weights off the elastic band relaxed to a state slightly bigger then its original size. An increase of 1.5cm. Due to having foreknowledge of Hooke’s law made it easy to roughly predict what the results were going to be.
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