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Introduction

While doing the experiment we had to be aware of safety first. We first had to make sure that no one was sitting down while doing the experiment because if something happened they would have less time to move. We also had to make sure that the bags were under the bench otherwise people might trip while doing the experiment. For the safety of the others the experiment was conducted in an open space away from the people. To make the experiment a fair test I had to make sure that the clamp is absolutely straight because if it is crooked I won't get the same length of each elastic band. I had to make sure that all four elastic bands were at the same length and the same shape so that we get a fair results. When we did the experiment with two, three and four elastic bands we had to put a metal rod underneath all the elastic bands and place the weights right at the middle of the rod (this is because if we put it at one side of the rod, the rod will be crooked and the measurement for each elastic band wont' be accurate). ...read more.

Middle

If we add another elastic band and keep the same weight, the extension will be half. For three elastic bands, the extension will be 1/3, and for four it will be 1/4. I can prove my prediction as follows: - Elastic energy equals Average force multiplied by the distance. In my example for four bands average distance moved for 100 grams weight was 2mm. To calculate the force in Newton, I changed the grams into kilograms by dividing it by 1000, and then to change the Kg into Newtons I multiplied it by 10. Therefore: Force = 100/1000 x 10 = 1 Newton The distance moved for four bands = 2mm To change it into Meters, I divided it by 1000. Therefore, distance moved = 2/1000 = 0.002 metres. According to the formula: - Energy = force x distance 1 x 0.002 0.002 Joules Now if there are two elastic bands instead of four, the force in each band will be = 0.002 x 2 = 0.004J According to joules: - Distance = 0.004/1 = 0.004 This means when energy is doubled the distance is also doubled (because energy is proportional to the distance). This can be proved in the results I obtained during the experiment. ...read more.

Conclusion

Similarly the rod must be exactly horizontal for accurate results. The center of the rod should also be marked so that the mass is always attached at the same point all the time. Result table 2: - Weight (g) 1 2 3 4 100 12.5 11.0 11.4 11.1 200 12.7 11.5 11.6 11.7 300 13.3 12.0 11.8 11.8 400 13.7 12.5 12.0 12.0 500 14.4 13.0 12.2 12.1 600 15.1 13.4 12.4 12.2 700 15.8 13.6 12.7 12.2 800 16.5 13.8 13.0 12.3 900 18.0 14.0 13.0 12.4 1000 19.1 14.4 13.3 12.6 1100 19.6 15.0 13.5 12.7 Results for chart 3 Weight (g) 1 2 3 4 100 12.3 11.5 11.5 11.0 200 12.5 11.6 11.7 11.2 300 13.2 11.8 119 11.5 400 14.3 12.1 12.1 11.7 500 14.5 12.3 12.3 11.8 600 15.1 12.4 12.4 11.9 700 16.2 12.7 12.6 12.2 800 17.6 13.1 12.7 12.3 900 18.4 13.3 12.9 12.4 1000 19.2 13.3 13.0 12.5 1100 20.1 14.2 13.2 12.6 The Average result: - Weight (g) 1 2 3 4 100 12.3 11.3 11.5 11.1 200 12.5 11.6 11.6 11.4 300 13.2 11.0 11.8 11.6 400 13.9 12.3 12.0 11.7 500 14.3 12.6 12.2 11.8 600 15.0 12.9 12.3 11.9 700 15.8 13.1 12.5 12.0 800 16.7 13.5 12.7 12.2 900 17.8 13.7 12.8 12.2 1000 18.8 13.9 13.0 12.4 1100 19.7 14.5 13.1 12.5 Mohsin Mahmud 25/2/2002 ...read more.

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