Pulleys:
A pulley is a wheel with a groove around itthrough which runs a belt. They are used to control how fast something turns. Pulleys are also used to make lifting easier. Other examples of pulleys are in cassette recorders, washing machines and cranes.
1. When there is a big wheel and a small wheel on a belt - the big one rotates more slowly than the small wheel but with greater force.
2. A twistr in a belt (pulley) makes the wheels turn in the opposite direction.
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