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# Investigation to find out whether or not it is correct to call a rubber band elastic.

Extracts from this document...

Introduction

Elastic band investigation

Aim: -to find out whether or not it is correct to call a rubber band elastic.

Plan: - The factors affecting the elasticity of a rubber band are:

• Downward force applied to the band
• The type of rubber the band is made from.
• The length of the band
• Cross sectional area of band

The variable I am going to investigate is the effect of weight on the rubber band. This is a continuous variable. I am going to measure the distance the rubber band has stretched after each amount of weight is placed on it. I am going to keep taking lengths until the band brakes.

## Pilot test: -

To decide what amount of mass to step up in I am going to run a preliminary experiment. I am going to find the elastic limit of three rubber bands. To do this I added weights until the band snapped.

 Test Number of masses at which band broke 123 222025

To work out how many masses to go up in I am going to divide the number of masses at which the band broke into 10 equal pieces. This gives me 2.2, 2.0 and 2.5 as 2 is the average round number I will use this.

Middle

2.6

3.5

7.5

14.0

22.0

23.0

24.0

26.1

26.8

27.5

28.6

29.7

30.0

30.8

31.0

-

4.0

10.5

18.5

19.5

21.5

22.6

23.3

24.0

25.1

26.2

26.5

27.3

27.5

 2nd rubber band Weight (kg) Length (cm) Extension (cm) 00.20.40.60.81.01.21.41.61.8 4.015.123.025.627.929.631.532.333.635.0 -11.119.021.623.925.627.528.329.631.0
 3rd rubber band Weight (kg)

Conclusion

K=F/X

When:

K= spring constant

F=force applied

X = extension caused

## Evaluation: -

I believe the resultes I have gathered are reasonably reliable and accurate, most of my average results are very close to the line of best fit, except for one or two anomalous results. My repeats are all similar this shows that they must be reliable as otherwise they would all be totally different. The few anomalies caused on my experiments could have been caused by human error. When placing the masses on the band it is possible not enough care was taken and extra force was applied by the person adding the weight. I think my method was suitable for this experiment though there are a few improvements I would make to it if I was to do the experiment again. I would try to find a better way to add the weights to the rubber band, as I think this would make my results more accurate and possibly eliminate anomalies as I believe this is what caused  them in my results. to make the experiment more accurate I would use some form of mechanical measureing device, rather than a ruler as this would meaurse the extension to a much finer degree.

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