Q. 14 The center of gravity of a body on the earth coincides with its center of mass for a small object whereas for an extended object it may not. What is the qualitative meaning of small and extended in this regard? For which of the following two coincides? A building, a pond, a lake, a mountain?


Hint: Recall the concept of center of mass.
Step1: Interpret the small and extended objects.

When the vertical height of the object is very small as compared to the earth's radius. we call the Object small, otherwise, it is extended.

Step 2: Give examples of small and extended objects. 

(i) Building and pond are small objects.
(ii) A deep lake and a mountain are examples of extended objects.