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Units and Measurement
Question
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A projectile is fired from O so that it follows the parabola path OPQ. If the projectile explodes in mid air and fragments fly in different directions, then what path the centre of mass will follow?

Answer

The centre of mass will continue to follow parabola path OPQ. The position of the centre of mass is independent of  the path taken by the mass. Thus, the position remains the same.

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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?