Consider a body consisting of large number of particles each of mass 'm' and each particle is attracted by the earth towards its centre with weight of 'mg'. Like this, the weight of various particles constitute a system of like parallel forces. The resultant of these forces are passing through a point in the body. That point is called the centre of gravity of the body.
Therefore the centre of gravity of a body is the point through which the weight of the body acts.
In case of small bodies, the centre of gravity and centre of mass almost coincide. Suppose if the body is large and so extensive that the acceleration due to gravity changes from one point to another point in the space occupied by the body where centre of gravity and centre of mass are different.
The main difference between the centre of gravity and centre of mass is that centre of gravity depends upon acceleration due to gravity on different particles of the body, on other hand, centre of mass is independent of acceleration due to gravity.
Centre of gravity is defined as the stability of the body when supported, on the other hand, centre of mass is defined to describe the motion of the body as a whole.
No comments:
Post a Comment