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Pulley: This simple machine is made up of a wheel and a rope. The rope fits on
the groove of the wheel. One part of the rope is attached to the load. When you pull on one side of the pulley,
the wheel turns and the load will move. Pulleys let you move loads up, down, or sideways. Pulleys are good for
moving objects to hard to reach places. It also makes the work of moving heavy loads a lot easier.
to find the MA (mechanical advantage) of a pully
= the number of ropes supporting the weight
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