A fixed pulley is a wheel that has a groove around it into which a rope, chain or belt fits. It rotates around an axle that is fixed to an inmobile surface.
A fixed pulley is ballanced when the effort F is equal to the resistance of the load, R:
F=R
2. MOVABLE PULLEY
A movable pulley is a set of two pulleys- one is fixed while the other can move in a linear direction.
A movable pulley is balanced when it satisfies this equation:
R
F = -----
2
3. COMPOUND PULLEY
This is a system of fixed and movable pulley, often called block and tackle.
R
F=--------
2n
n= number of movable pulleys.
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