ABSTRACT
Every particle of a body is acted upon by the force of gravity. The force of attraction which is proportional to the mass of the particle acts vertically downwards and is known as weight of the body. As the distance between the different particles of a body and the centre of the earth is the same, therefore these forces may be taken to act along parallel lines. This point through which the whole weight of the body acts irrespective of its position is known as centre of gravity, written as CG. It may be noted that everybody has one and only one centre of gravity.
