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A pulley is a wheel with a groove along its edge, for holding a rope or cable.

Table of contents
1 Types of Pulleys
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.

Plutarch reported that Archimedes moved an entire warship, laden with men, using compound pulleys and his own strength.

Pulley Images

Early Pulleys

Single Fixed Pulley

Single Movable Pulley