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Units and Measurement
Question
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The cap of pen or a tap can be easily opened with the help of two fingers than with one finger. Why?

Answer

A single force is applied with the help of one finger. And, two forces in the opposite direction is applied with the help of two fingers.
Rotational motion produced by a single force is less than two equal and opposite forces. Therefore, it is easy to open the cap with the help of two fingers rather than one finger.

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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?