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An Investigation into the elastic properties of different thickness of elastic bands

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Introduction

An Investigation into the elastic properties of different thickness of elastic bands.

Planning

Aim:the aim of this experiment is to find out what effect that different thickness’ of elastic bands has to the amount they stretch under a series of different weights. To test this I shall use different thickness’ of elastic band that are all the same length.. The final adjustment I shall make is to measure the thickest band with greater weights as well. This will show the effect of weight and its relation to the amount the band stretches.

Hypothesis:

According to hook’s law the expansion of a spring is proportional to the weight it supports. If the same applies to the rubber band it to should increase in the amount it has expanded when a greater weight is applied. I therefore am able to predict that although not all the time the band will expand at the same rate as the amount of weight applied. However elastic bands are not quite as elastic as springs and so I do not expect this to be completely true.

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Middle

Variables:    

The 2 things I am going to change (on purpose) is the thickness of the band and the amount of force pulling on the band. I will only change one variable at a time. The fact that I shall have to do it over two days could affect the temperature of the band and this could have a direct effect on the results of the elastitisity band. I shall however use the same equipment for the experiment. The person who looks at the elastic band shall be the same all the time.

Measurements:

I am going to measure the length of the band between 0.1cm and 30 cm. This shall be accurate to 0.1 of a cm. The weight being used on the band shall be measured between 10grms and 500grms.

Plan/Method:

First of all I shall start of with the thinnest band and with the 10grm weight. After I take down the result I shall increase the weight by 10grms and take the result again. I9 shall repeat this until I get up to 150grm where I shall increase the weight by 50 grams and take the result.

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Conclusion

This is shown in band 12 and Band 2 where the band suddenly stretches a lot greater then previously. These results compliment my hypothesis very well.

Evaluating Evidence

The Evidence:

I had plenty of evidence as a clear pattern can be seen in each of the band graphs. These patterns also make a lot of sense. The evidence was very accurate however it was not as accurate as it could have been. A few pieces of evidence can be seen to make not as much sense in the whole feel of the graph. However these differences are not massive. The evidence is still good enough to support my theory. As there is enough of it and it is quite accurate.

Improvements:

I could have improved my experiment by using a ruler to check out the length to be sure. This would have made my results more accurate but probably would have made the pattern the same. I could have extended my experiment  by including more results between 150 to 500.  

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