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# Find out if the motion of an elastic band changes, by the rate of its extension.

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Introduction

Plan Aim The aim of my investigation is to find out if the motion of an elastic band changes, by the rate of its extension. So in other words if an elastic band is extended to 20cm, will it fire a greater distance, than a band which is extended to 10cm, and if so why? Research You can change the shape of a material by applying enough force. When you stop applying the force, some materials retain their new shapes; these are plastic materials. Other materials return to their old shape when you stop applying the force; these are elastic materials. Elasticity is the ability to return to their original shape after being stretched, for example: an elastic or rubber band. When you pull an elastic material, it stretches and increases in length. At first, when you double the pull, you double the increase in length. However, as the pull increases, you reach a point where the material no longer returns to its original shape. This pull is the elastic limit of the material. Energy transfer Energy is the capacity to do work. There are ten types of energy transfer each of which are explained below. Most types of energy are ultimately derived from the sun, or from radioactivity. All types of energy are measured in joules (J). * Electrical energy = whenever a current flows. ...read more.

Middle

establish a reasonable average result for each unit the band is extended, and to produce a good plotting point for each result on my graph, in order to be able to distinguish a pattern within my readings. Method To answer the questions in my aim, I plan to carry out an investigation, in which I will catapult an elastic band in to the air, which will be extended from various extensions. I will then proceed to measure the distance travelled by each new extension of the elastic band, using a meter rule, and from my result determine certain trends from the graph to answer the questions asked in my aim. The length at which the elastic band will be extended to, will start from an extension of 0.12m, and will continue all the way up to 0.18m. A tape measure (total length of 7.0m) will be cello taped to the floor so that when the elastic band is catapulted, the distance travelled by the band can be measured accurately. The elastic band will be catapulted off the end of a meter stick, 0.78 m off the floor in front of the tape measure, which is taped to the floor. The band will be flung off the end of a meter stick, because the extension of the band can be measured easily using the units along the side of the meter rule. ...read more.

Conclusion

Due to there being a definite relationship between the points, it is possible to draw information from it. On the graph, there is a positive increase and correlation, which can be seen. At first, the increase is quite a steep one but then it gradually slopes off to a shallower gradient. However, I don't think I collected enough evidence, but it was as accurate as it could have been in relation to the results, and there was enough evidence to support my conclusion. As a whole, I think that the experiment worked out extremely well. However, one way which I could have used to improve my investigation is to have repeated the experiment another time. Therefore, I would get another average to add to my graphs to help support the rest of my conclusions. Another technique I could have used to improve my investigation would be data logging. This would have made collecting my results and recording them much easier. I would have liked to extend my investigation. One way in which I could have done this is to measure the peak height at which the band reached each time it was travelling through the air. I also would have liked to measure the force, which was acting on the rubber band to see how that affected the distance travelled. This would have been very enjoyable. However, I did not have enough time and there was also a lack of equipment which I would have needed. - 1 - ...read more.

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