Class 1- Measurement : Foundation - Class 8 Physics

Measurement and Physical Quantities

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Why can't we use hand span or cubit for precise measurement?

<span style="font-weight: 400;">They are different for each person</span><span style="font-weight: 400;"><br /></span>

Which of the following is a derived quantity?

<span style="font-weight: 400;">Volume</span><span style="font-weight: 400;"><br /></span>

Why can't we use hand span or cubit for precise measurement?

<span style="font-weight: 400;">They are different for each person</span><span style="font-weight: 400;"><br /></span>

Which of the following is a derived quantity?

<span style="font-weight: 400;">Volume</span><span style="font-weight: 400;"><br /></span>

What is a Physical Quantity?

A quantity that can be measured and used to describe the laws of physics. It is represented as $Q = nU$, where $n$ is the numerical value (magnitude) and $U$ is the unit.

How is a physical quantity represented, and what is the relationship between its numerical value and unit?

A physical quantity (Q) is represented as $Q = nU$, where $n$ is the numerical value and $U$ is the unit. For a given physical quantity, the product of the numerical value and the unit is constant ($N \cdot U = \text{Constant}$), implying $N \propto \frac{1}{U}$.