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Units and Measurement
Question
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Why moment of inertia of a body is always referred to about an axis?

Answer

Moment of Inertia of a body is always referred to about an axis because by changing the axis of rotation, the distance of constituent particles from the axis of rotation also changes. Therefore moment of inertia of body about different axis is different. That is, reference axis is required in order to find the moment of inertia. 

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Some More Questions From Units and Measurement Chapter

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?