Physics [1 Mark Question Answer]

A pulley is a flat circular disc having a groove in its edge and capable of rotating about a fixed point passing through its centre and is commonly called axle.

When a lever is in equilibrium, the clockwise moments of the load about the fulcrum is equal to the anticlockwise moment of the effort about the fulcrum, provided the lever is weightless and offers no friction.

A lever is a straight or bent rigid bar capable of turning around a fixed point called fulcrum.