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  • The centre of mass of an extended body on the surface of the earth and its centre of gravity a) are always at the same point for any size of the body b) are always at the same point only for spherical bodies

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

a) are always at the same point for any size of the body

b) are always at the same point only for spherical bodies

c) can never be at the same point

d) is close to each other for objects, say of sizes less than 100 m

e) both can change if the object is taken deep inside the earth

Answers (1)

The correct answer is the option (d). For smaller bodies, the COM (Center of mass) and COG (Center of gravity) usually coincide. For extended objects like mountains and lake, they are far away. COG is the point in a body where net torque due to gravity is 0. The COM is where the whole mass of a body is supposed to be concentrated.

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