Science - The Lever

A lever is any rigid body which is free to turn about a fixed point or line called a fulcrum

See-saw

Scissors

A fulcrum is the fixed point or line through which something swings

When a lever is balanced the sum of the clockwise moments is equal to the sum of the anticlockwise moments

The centre of gravity of an object is the point through which the weight of the object appears to act

This is when an object is balanced