The centre of mass of an extended body on the surface of the earth and its centre of gravity
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: An object is said to be small if its vertical height is very small compared to the radius of the earth. If the vertical height of the object cannot be neglected as compared to the radius of the earth then the object is said to be extended. In case of a building and a pond, the centre of gravity coincides with the centre of mass. A deep lake and a mountain are extended objects. So, their centre of gravity and centre of mass differ.
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