Page 7 - SIMPLE MACHINES

2. PULLEY –

 A pulley is a simple machine consists of a wheel that has a grooved outer edge or track
for the rope, belt or chain to move through it. This groove holds the rope, belt or chain
in position.
 A pulley is a circular lever, with the wheel rotating freely on the axle. Pulling the rope
lifts the object attached to the other end.

Types of pulley:
 A pulley can be of two types-

A. Fixed pulley –

 A fixed pulley acts as a first class lever. The fulcrum is the axle (the point at which

the pulley is supported).
 In a pulley, an effort is applied in one direction and a load moves in another
direction.
 In a fixed pulley, the pulley is fixed to a support, such as wall. One end of the rope is
attached to the load.

 Examples of fixed pulleys :

1. Fixed pulley can be seen on flag poles, a flag is raised on a flag pole with a pulley.