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ICSE Class 10 Answered

What is the difference between centre of gravity and the centre of mass

Asked by Shiprapandey2906 | 18 Mar, 2020, 05:20: PM
Expert Answer
Centre of mass of a rigid body is also called its centre of gravity. However, this is true only in circumstances where gravitational forces are uniform. Since gravitational force of earth is taken to be uniform at all places, the centre of mass and the centre of gravity are effectively same.
Centre of gravity is defined as the average location of the weight of an object. In the case of earth, since gravitational pull is same at all places, each mass element would weigh the same so the centre of gravity is identical to the centre of mass.
However, in a non-uniform gravitational field, the centre of gravity is not the same as the centre of mass.
Centre of mass is a fixed property which is the average location of the mass of the body. It has nothing to do with gravity.
Consider a situation in which gravitational field is non-uniform. Also, imagine a very long uniform rod.If you consider two parts of rod with same mass, the force of gravitation (weight) will be different on both instead of same mass.
Due to which, its centre of gravity and centre of mass will be different. Because of this, the position of centre of mass of this rod will be different from that of centre of weight. 
Answered by Shiwani Sawant | 18 Mar, 2020, 06:16: PM
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