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Simple machines/Pulley

From Wikiversity

A pulley is one of the simple machines that make life easier. It is a wheel with a grooved rim around which a cord passes. It acts to change the direction of a force applied to the cord.

There are two types of pulleys.

The pulley is used mainly to lift heavy objects. If you have a wheel or more, and put a rope around them, you've created a pulley.