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  • Level: GCSE
  • Subject: Science
  • Essay length: 1177 words

An investigation to find out how different variables will effect the movement of a wooden block.

Extracts from this essay...

Introduction

An investigation to find out how different variables will effect the movement of a wooden block Aim: Trying to find out how weight and the pull back of an elastic band will affect distance travelled on a wooden block on a particular surface. Prediction: I will predict that as the amount of mass applied onto the block, the faster the block will slow down and it will go less far. Adding on to that, I reckon if the weight applied on the block is doubled then the distance travelled will half. This is because there will be more friction between the block and the desk and there will also be more gravitational pull acting downwards on the block which will slow down the wooden block. Scientific Theory When you pull back the elastic band, storage energy is made which is the potential energy of this experiment. And the more that the elastic band is pulled back or the more elastic bands used in the experiment, there will be more potential energy. After the block is released, some of the potential energy is transferred to kinetic energy when the block slides along the surface.

Middle

As with all scientific experiments, only one variable must be altered at one time. All the rest must remain constant to ensure good sensible results. By using present knowledge, I know that the following factors can affect the outcome and must be controlled and kept the same. Only the weight exerted on the block should be allowed to change, everything else, like the distance pulled back by the elastic band, the numbers of elastic bands and the surface that the block slides on must be kept exactly the same throughout the whole experiment. Apparatus * Rubber bands * Wooden block * Desk surface (wooden) * Meter rulers * A stool Safety There will definitely be safety precautions to take when doing this experiment. Plan of Investigation Based on the preliminary experiment, the investigation to find out how different amounts of elastic bands which was used to propel the wooden block affected the total distance travelled. But since there wasn't sufficient space in the lab to undergo this experiment the investigation failed to achieve any usable results. This was because the block slid too far and recordings would've been inaccurate as there will be a gap between two joining tables, so the variable will be the weight in the proper investigation.

Conclusion

Moreover, if the block spins around when it is propelled, the experiment will be restarted. Results Elastic band pulled back (cm) Mass added (g) Results (cm) Average 1 2 3 25 100 93 93 91 92.33333333 25 200 58 63 65 62 25 300 44 44 45 44.33333333 25 400 28 34 30 30.66666667 25 500 21 22 23 22 25 600 17 15 17 16.33333333 25 700 10 8 11 9.666666667 Below are the graphs for the three test results and the average of the three tests results, which has been done on the computer to show the precise accuracy of the numbers. Analysis of Results In my prediction I said that the block would slow down quicker if more mass was applied on it. Evaluation There were definitely some human errors and apparatus problems through put the experiment. The elastic band may have not been pulled back enough or even pulled back too much. The elastic band also may've stretched past its elastic limit which will cause a slight change in results. The surface of the desk is also important, as there will be graffiti marks and pen marks. But as my graph shows quite a smooth curve, meaning the errors would've been fairly minor.

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