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# My aim is to find out the total extension of a rubber band when weights are added.

Extracts from this document...

Introduction

Physics Coursework

Stretching a rubber band

## My aim is to find out the total extension of a rubber band when weights are added.

Fair Test:

To keep the experiment a fair test I am going to keep the amount of weights I add each time the same I am going to keep the weights 100g. I will also keep the rubber band the same size for each experiment and always use a setsquare to ensure that my results are as accurate as possible.

Safety:

To ensure that my experiment is completely safe I will have to make sure that everything is secure and firmly on the table, you have also always got to stand while carrying out an experiment and keep all equipment that is not related to the experiment out of the way.

Apparatus:

Variables:

Middle

100

26.1

200

21.9

300

15.5

400

9.8

 Number of weights (g) Thick Band (cm) Total Extension of band (cm) 0 28.4 100 26.9 200 24.9 300 21.9 400 18.1

Prediction:

I predict that as I increase the amount of weights I add the total extension of rubber band will also increase. Here is a scientific theory that backs up my prediction:

Rubber is made up from very long molecules that are called polymers; these are normally all tangled up. When the weights are added to the rubber band the molecules will untangle. When the molecules are completely untangled then they are very difficult to stretch anymore.

#### Obtaining Evidence

Safety:

• Stand up- you have always got to remain standing while doing the experiment so if an accident occurs then you can get away quickly
• Make sure that there is nothing in your way to prevent any accidents
• Make sure that the apparatus is not at the edge of the table
• Make sure that all the stools are pushed under the table

Conclusion

As you can see from my graph there is a pattern as the more weights are added the total extension of the rubber band gets larger, this is shown by the more weights added the steeper the gradient.

Evaluating Evidence

I think that the results that I got were very accurate. My results prove that my prediction that I made is correct, I found that my experiment was quite accurate but I could have made some mistakes when I was taking the readings with the setsquare. From my results I can see that there were no anomalous results. I can tell that my results are very reliable, there is not a lot of difference between the first times I carried out the experiment to the second time. If I were to repeat the experiment I would make the experiment more reliable by using weights that are not as heavy this would make the experiment more accurate.

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