2.2 PULLEYS AND COMPOUND PULLEY SYSTEMS:
In a system of pulleys,the equilibrium between the forces depends ion the parth that the rope follows.

PULLEYS:
Fixed pulley:the forces are equal because the rope moves the same distance on both sides.We can use gravity and our own weight to help us.It´s easier to lift a weight by pulling down than by pulling up.

 Movable pulley:the rope follows a double path around the pulleys.We need half the force to lift the same weight as with a fixed pulley.We must pull twice as much rope to lift an object to the same height.