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Units And Measurement

Question

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Define centre of mass and centre of gravity.

Solution

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.

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?

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