Pulley is a simple machine consists of wheel and axle that is combined with the rope or chain or other cord passing from the surface of the wheel to move something up and down or back and forth.The pulley can be combined with other pulleys to reduce the amount of effort to lift huge amount of weight or to lower them down. It can also move a flag up a pole from the ground. Pulleys are used in window blinds and drapery to move them up and down or back and forth. Pulleys are also used on ships to raise and lower loads and on cranes for use in moving construction equipment.

Pulley and rope

What is a pulley?

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