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# Do Elastic Bands Obey Hooke Law

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Introduction

Do Elastic Bands Obey Hooke's Law? Aim; To plan an experiment to investigate if elastic bands obey Hooke's Law Prediction; The elastic bands do obey Hooke's Law Equipment; * Clamp stand * Rubber band * 50g weights * Ruler * Clamp Method; * Take one rubber band at random and attach it to a clamp * Measure the length of the rubber band and record the length * Add weights to the rubber band (50g each time) * After each weight is added record the length of the rubber band * Keep adding the 50g until the rubber band snap or deforms Variables; * Weight of the weights Controls; Rubber band * Height of clamp stand * Start point of measuring the length ...read more.

Middle

42.7 850 8.5 43.4 900 9 44.1 950 9.5 48.9 1000 10 50 1050 10.5 53.5 1100 11 Graph; Conclusion; This experiment has proven to me that a stretched rubber band does not apply to Hooke's Law. This is backed up with the results I have collected and the gradient of the graph I have drawn. If a stretched rubber band was to apply to Hooke's Law then the length it is stretched would be proportional to the weight exerted. For something to apply to Hooke's Law it must apply to the following statement. For Hooke's Law gives the relationship between the force applied to an un-stretched object and the amount the spring is stretched when force is applied to it. ...read more.

Conclusion

This first thing is the mistake of inaccurately measuring the length of the rubber band. Since the rubber band is bouncing around it is difficult to measure from the same starting point each time. Also since the rubber band is bouncing around it is hard to find the exact length of the rubber band, so I would have to approximate between numbers. This is one of the main causes of differential length results. Another point is that each elastic band has different elasticity. So if I were to carry out this investigation with a different rubber band I would expect to get different results. If I were to do this investigation again I would attach the ruler to the clamp stand for more accurate results, this is what I failed to realize the first time around. ?? ?? ?? ?? ...read more.

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3 star(s)

This is a 3 star piece of work. There is a base to build on. The practical method would give valid results. The evaluation could be improved upon by talking about more ways to improve on the method used.

Marked by teacher Kate Gardiner 01/12/2012

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