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Units and Measurement
Question
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 Define centre of mass and centre of gravity.

Answer

Centre of mass of a body is the point where the whole mass of the body is supposed to be concentrated.
Centre of gravity of a body is the point where whole weight of the body is supposed to act or concentrated.

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Some More Questions From Units and Measurement Chapter

Can we use different units to measure same physical quantity?

To measure a physical quantity X, the unit U is repeatedly used for n times. What is the magnitude of physical quantity?

Does the numerical factor in the quantitative measurement depend on the system of unit used?

Is one unit sufficient to measure a physical quantity?

Can a physical quantity have two or more units? Give example.

What are fundamental quantities?

How many fundamental quantities are there in mechanics?

How many fundamental quantities are there in Physics?