A pulley is a wheel with a groove along its edge, for holding a rope or cable.
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2 Pulley Images
Types of Pulleys
So, for instance, if one end of the rope is attached to a fixed object, pulling on the other end will apply a doubled force to any object attached to the axle. This can be increased by using a block and tackle, where there are several pulleys on each axle. Pulleys are usually counted as one of the simple machines.