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# Investigate if the angle of which the elastic band is released at affects the distance travelled by the rubber band.

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Introduction

Elastic Band Investigation Aim: I aim to investigate if the angle of which the elastic band is released at affects the distance travelled by the rubber band. And to find out the best angle to fire an elastic band the longest distance possible. Apparatus: * Elastic Bands x 1 * Metre Stick x 1 * Tape Measure 10 metres long * Large Protractor * Results Table * Stool Planning: Before actually planning the experiment, I will do some research to find out about osmosis, and matters related to it, so that I can make predictions. And figure out a way to make this investigation fair and safe. Planning ahead would help me find out how to do what, when, which should lead me to good results at the end of the experiment. Hypothesis: 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. When you pull an elastic material, it stretches - increases in length. At first, when you double the pull, you double the increase in length. As the pull increases, however, when you reach a point where the material no longer returns to its original shape. This pull is the elastic limit of the material. ...read more.

Middle

But other than that, there were not any bigger matters to be cautious of. But all laboratory rules were carried through correctly. Diagram: Method 1. Set the Experiment up as the diagram shows above. 2. Place the measuring tape at the end of the ruler attached to the stool, and pull the tape out until over 6 metres is in place. 3. Pull the elastic and back 10 centimetres and release after 4 seconds of the band being at 10 centimetres. Table of results: Angle where the Elastic Band Is Released 15� 20� 25� 30� 35� 1 432 466 416 430 321 2 321 428 394 375 292 3 402 424 407 372 454 4 389 441 417 440 368 5 446 494 430 397 387 Average 398 450.6 412.8 402.8 364.4 Angle where the Elastic Band Is Released 40� 45� 50� 55� 60� 1 361 290 281 261 245 2 319 313 254 250 241 3 348 327 276 244 456 4 338 357 263 239 225 5 354 340 290 258 231 Average 344 325.4 272.8 250.4 279.6 Analysis: This graph shown above gives the line of best fit for the average distance travelled by an elastic band, when fired at different angles, over the course of the experiment. The graph is a curve that slopes downwards and does not go through the origin. Because the line is not straight and does not pass through the origin, it means that the average distance travelled and angle of firing are not directly proportional. ...read more.

Conclusion

And at 50 degrees the flight path of the rubber band is much steeper and therefore more energy is lost due to air resistance. You can see this in the diagram above. Evaluation: I followed the plan correctly, and believe we gained accurate and sufficient enough results to conclude the experiment, and to prove our hypothesis. My final results were very reliable, due to the precautions I took to make this a fair test. To make this experiment better, I believe that we could have used a pin to hold the elastic band back on the ruler to that the pull back was exactly 10 centimetres each time. As I only pulled back to 10 centimetres which could have been in the range of 9.5 to 10.5 centimetres. Also if I could use the same force on the pull back each time would have made my experiment even better. But as I have already said I believe my experiment was carried out correctly and the data gathered was sufficient enough to agree with my hypothesis. Repeating the same tasks many other times would not have been very useful, since we had already done the result 5 times, and ALL the results were reliable. Even though we did not use these experimental plans, we still got results, which were correct, according to my hypothesis, and backed, up my predictions. But overall, given the apparatus that we got to carry out the test, I think this experiment turned out to be very successful, and I'm very please with my results. Fredrick Elliott Physic Coursework 11MS ...read more.

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