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To See Which Surface Is the Roughest

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Introduction

FRICTION Aim: To see which surface is the roughest Prediction: I think sandpaper will be the roughest surface because friction will act when the solid surface of the tyres is in contact with the surface of the sandpaper. The two surfaces catch on each other. When the tyre is moving one way, the friction force acts in the opposite direction. I think paper will be the least rough surface because it will have little friction acting on the car, which would make it easy for, the to car move. ...read more.

Middle

Apparatus: Sandpaper Wood Paper Polythene Foam Car Diagram: surface car force metre Table Method: I set up the apparatus by:- 1- placing the surface on the table. 2- I then put the car on top of the surface. 3- I hooked the string on to the force metre. 4- I tested five surfaces and found my result by pulling the string slowly till the car moved from the surface and read the result off the force metre. ...read more.

Conclusion

Evaluation: Sandpaper made the car exert the most force to move and it took the most time to move. The result showed the greater the friction the less movement there was. It was less likely to move on sandpaper then it was on the other surfaces. The other surfaces showed very little friction acting on the car, which made it difficult to slow the car down. I could have made the experiment better by applying cello tape on to the surface so it remains flat. I could have also made it better by testing the result four or five times to get an accurate reading. ...read more.

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