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.
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 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
* Scales
Diagram of Apparatus
Results
Adding weights
Weight
Length of elastic band
Extension
0g
11.5cm
0cm
100g
13cm
1.5cm
200g
15cm
3.5cm
300g
20cm
8.5cm
400g
23.5cm
11cm
500g
30cm
18cm
600g
36cm
25cm
700g
41cm
29.5cm
800g
46.5cm
35cm
900g
49cm
37.5cm
1000g
52cm
40.5cm
Taking weights off
Weight
Length of elastic band
Extension
1000g
52cm
40.5cm
900g
63cm
51.5cm
800g
63cm
51.5cm
700g
59cm
47.5cm
600g
58cm
46.5cm
500g
48cm
36.5cm
400g
30cm
18.5cm
300g
23cm
11.5cm
200g
15cm
3.5cm
100g
15cm
3.5cm
0g
13cm
1.5cm
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.
Conclusion
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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