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# To Measure a Force of Friction and To Compare the Area of Contact.

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Introduction

The Force of Friction Aim To measure a force of friction and to compare the area of contact. Apparatus * Newton Meter - 10N in 0.1N intervals * Rule - 1M in 0.1M (1CM) intervals * 100g weights X4 * 10g weights * Wooden Board * Stand and two clamps * Pulley wheel (mounted onto a board) * Wooden Block Diagram Method Set up apparatus as shown above. Prepare blocks, which measure 100mmX100mm, 150mmX100mm, 200mmX100mm, 250mmX100mm and 300mmX100mm. Place the correct amount of weights on top of the smallest block so that the block weighs the same as the heaviest block. Place the block near the end and pull the board at a constant speed. ...read more.

Middle

Prediction An increase in the size of the block will decrease the force of friction in direct proportion to each other, this is because as blocks get bigger there is more surface area to spread the weight on and this means that there will be a bigger area of contact. I also think this because we did some preliminary testing for an experiment to measure a force of friction and to compare that force to the weight of the sliding body. The results that we got from this experiment showed that as the weight of the block increased, the friction increased Preliminary Results Weight of the block (g) ...read more.

Conclusion

Evaluation My prediction was wrong; I know this because my results stayed the same all of the time. The graph also shows this as it is a horizontal line and if my prediction was correct the graph would go diagonally upwards. There is an obvious trend in this experiment, which is also shown by the graph in, by the fact that it is a horizontal line. My results were all the same which shows that I did the experiment correctly. You can get another question from this experiment and that is, "What would happen if the original weight of each of the blocks did not change?" ...read more.

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