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Units And Measurement

Question

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A rigid body is rotating about an axis. Different particles are at different distances from the axis. Do different particle possess same linear velocities like angular velocity?

Solution

No, different particles move with different velocities if they are at different distance from the axis.

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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