Question

The centre of mass of an extended body on the surface of the earth and its centre of gravity

• A. can never be at the same point
• B. are always at the same point for any size of the body
• C. centre of mass coincides with centre of gravity of a body if the size of the body is negligible as compared to the size (or radius) of the earth
• D. are always at the same point only for spherical bodies

Answer 1

Answer: (C)

centre of mass coincides with centre of gravity of a body if the size of the body is negligible as compared to the size (or radius) of the earth

Answer 2

The center of mass of an extended body is the point where the entire mass of the body can be considered to be concentrated. It is the average position of all the individual particles' masses that make up the body. The center of gravity, on the other hand, is the point where the force of gravity can be considered to act on the body.