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A pulley is a simple machine which has a wheel with a grooved rim through which a cord or heavy rope can pass. It is mainly used in wells for lifting water, it is used in lifting heavy weights too. It is also used in hydraulic brakes.
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Yes it is actually used to apply the effort in a convenient direction
A pulley is a wheel like structured matter built to help in movement and change of direction of a thing. There is a belt placed around  it to make this possible.
eg: pulleys used in wells.

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