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Units and Measurement
Question
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Read each statement below carefully, and state, with reasons, if it is true or false

The instantaneous acceleration of the point of contact during rolling is zero.

Answer

False
This is because when a body is rolling, its instantaneous acceleration is not equal to zero. Instantaneous acceleration will have some value. 

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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?