How does a pulley make our work easy?

A pulley is a simple machine consisting of a wheel with a grooved rim in which a rope or a chain can pass. The wheel is mounted on an axle and is fitted to a frame called block and the wheel is free to rotate.

It makes work easy in two ways :

1. Single fixed pulley changes the direction of force – we pull down instead of lifting up.
2. Movable or block-and-tackle pulleys multiply the force applied, so we can lift heavier loads with less effort.

Example: Wells, cranes, lifts.