COMPOUND PULLEY SYSTEMS

A combination of fixed and a movable pulleys forms a block and tackle. A block and tackle can have several pulleys mounted on the fixed and moving axles, further increasing the mechanical advantage.

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PULLEYS AND COMPOUND PULLEY SYSTEMS

In a system of pulleys the equilibrium between the forces depends on the path that the rope follows. PULLEYS: FIXED PULLEY :  Has an axle mounted in bearings attached to a supporting structure. A fixed pulley changes the direction of the force on a rope or belt that moves along its circumference.  F: R MOVEABLE PULLEY:   Has an axle in a movable block. A single movable pulley is supported by two parts of the same rope and has a mechanical advantage of two. F: R/2
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