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Units And Measurement

Question

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What is the nature of motion of centre of mass of an isolated system?

Solution

An isolated system is a system which does not experience any external force. In the absence of external force, the centre of mass moves with a constant velocity. Thus, the motion of the centre of mass of an isolated system is in uniform motion.

Some More Questions From Units and Measurement Chapter

What is the need of measurement?

Define physical quantity.

Give four examples of physical quantities.

Define unit.

What are the two main required characteristics of a unit?

Can we use same units for different physical quantities?

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?

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