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# An experiment to find out how a number of pulleys effects the effort needed to lift a load of 1newton (100g)

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Introduction

Richard Aldridge 10 Gordon

An experiment to find out how a number of pulleys affect the effort needed to lift a load of 1newton (100g)

## Aim

To find out how a number of pulleys affect the effort needed to lift a load of 1 Newton (100g).

Hypothesis

I predict that as the number of pulleys we use increases, the effort needed to lift the pulley will decrease.

Fair test

There are many factors that could affect the results in this experiment all of which will have to be kept under control, if they were not kept under control then the results would not be fair. We will keep the test fair by keeping the load the same (1 Newton)

Middle

0.142

3

1

10g

0.5867

0.33

0.2567

Calculations

 Pulley number Friction in pulley system (N) (actual effort-theoretical effort) Mechanical advantage= Load (1N) /effort Energy output= Load (1N)Distance moved (m) Energy input=actual effort using counterbalance methodDistance effort rope pulled through

Conclusion

Evaluation

After competing this experiment it is possible to overlook some of the potential problems that may occur. The first problem was that the pulley itself was not very stable, this could also be due to a poor clamp, and often collapsed. Another problem that we occurred was that as the ropes passed each other they produced a lot of friction. This friction also occurred between the axel and the wheel, which made the experiment slightly more difficult than it, should have been.

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