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Does a rubber band obey Hooke's law?

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Introduction

Inderveer Singh Hothi

          Teacher:      Mr. Sidhu

               Form:      10H

Science group:      10D4

Physics Coursework

Does a rubber band obey Hooke’s Law?


Aim

Aim: Does a rubber band obey Hooke’s law?

Planning

Scientific Knowledge:

The seventeenth century scientist Robert Hooke

was the first person to realize that the extension of a

spring keeps in step with the force on it. So this

result is now called Hooke's law. A simple way of

describing this is by means of a graph. When the

extension is directly proportional to the force, the

graph is a straight line through the origin:

image00.png

The point at which a material ceases to obey Hooke's Law is known as its elastic limit. The first part is very easy. It means that the bigger the weight (stress) you hang on the string the more it will stretch (strain). The second part is also easy. Whilst the elastic limit is not exceeded, the string will go back to its original length when you take the weights off it, but if you add too

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Middle

Next set-up your apparatus as shown below.

Now start with your rubber band.

First record the measurement at the hanger.

Now add 1N

Then record the result by getting your small ruler and going across from the bottom of the spring to the 1m rule and record the result. Remember to try and keep your small ruler as horizontal as possible.

Now do steps 5-6 again each time adding on 1 extra Newton until your total gets to 10N.

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Conclusion

I could have compared a spring with a rubber band and talk about there differences and similarities.

After looking at my computerised and hand drawn graph I found that there were not any results that did not fall on my best fit curve, the reasons for this may have been that I was very accurate in my readings and that they were very precise.

If I did this experiment again I would make the following changes:

  • I would take the results down three times to improve the accuracy and precision of my results.
  • I would do the experiment with more weights so that we could see at what weight would reach the rubber bands elastic limit.

I could have improved my results and readings if I had done the following more carefully:

  • By double-checking the readings.
  • Taking care not to move the apparatus while conducting the experiment.

I can also do this investigation in a number of different ways:

  • Conduct the experiment with different types of rubber bands so that I could compare the differences and similarities between them.
  • I could conduct the experiment with a spring as well as a rubber band so that I could compare them.

INDERVEER SINGH HOTHI

...read more.

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