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# We are aiming to investigate the effect of force upon a spring. We will also investigate Hooke's law, to see what happens using two springs in parallel and series, and how this effects the spring constant.

Extracts from this document...

Introduction

Philip Harford 10O

Investigation  - Hooke’s Law

Aim:        We are aiming to investigate the effect of force upon a spring.  We will also investigate Hooke’s law, to see what happens using two springs in parallel and series, and how this effects the spring constant.

Background:        I know that Hooke’s law states that spring extension is proportional to stretching force, so long as the spring was not permanently stretched. In this investigation we will explore this statement.

Trial Run:        We did a trial run before starting the main experiment, and we found that we had to carefully put the weights on to the hanger, as the spring quickly stretches and could break.  We also had to make sure we took the measurements at the same place each time, i.e. at the bottom of the spring or the bottom of the hanger, as this could affect our results.  We also found that the spring could take 10N without deforming.

Prediction:        From the scientific knowledge above I can make a prediction about this experiment.  I predict that the extension of the

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Middle

20

353

333

363

343

338

0.026627

10

20

394

374

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0.026596

 Series Springs Ex1 Ex2 Average Force inNewtons (F) Distance to zero Total Extension (mm) Spring Extension (mm) Total Extension (mm) Spring Extension(mm) Spring Extension (mm) (e) k            (F/e) 0 30 30 0 30 0 0 0 1 30 110 80 111 81 80.5 0.012422 2 30 190 160 191 161 160.5 0.012461 3 30 268 238 272 242 240 0.012500 4 30 353 323 355 325 324 0.012346 5 30 439 409 438 408 408.5 0.012240 6 30 496 466 509 479 472.5 0.012698 7 30 575 545 590 560 552.5 0.012670 8 30 647 617 679 649 633 0.012638 9 30 716 686 750 720 703 0.012802 10 30 785 755 832 802 778.5 0.012845
 Parallel Springs Ex1 Ex2 Average Force inNewtons (F) Distance to zero Total Extension (mm)
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Conclusion

Lastly, the springs we used were not brand new, and had been slightly overstretched.  This has no effect on the stretching of the spring, and Hooke’s law still applies.  However, it did make it difficult to pick out a second spring exactly the same length for the experiment with two springs in parallel and series.  Again this could have an effect on our results.

Although I think our experiment was carried out well and reliably, I think there was still potential for improvement.  If I were to repeat the experiment I would make a few changes.  I would make sure the springs were new springs, or not stretched past their yield point to make our results even more accurate .  I would also make sure the same person did the measuring each time and their technique used was  repeatable.

To further improve my results and extend the experiment, I could make a few other changes.  I could take measurement at every 0.5 Newtons, which would increase the number of readings.  I could also use three springs in parallel and series to see what effect this has.  Lastly, I could extend the springs to beyond their yield point and see what effect this had on the results.

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