Question

What are physical quantities? Give example

Answer 1

Answer:

A physical quantity is a quantity which can be measured. For example length of a stick, here length is a physical quantity. Similarly volume of water, here volume is a physical quantity.

FUNDAMENTAL QUANTITIES: Those quantities which do not depend on other quantities are the fundamental quantities. There are seven fundamental quantities. These are Length, Mass, Time, Electric Current, Temperature, Luminous Intensity and Amount of Matter.

DERIVED QUANTITIES: Those quantities which are dependent on fundamental quantities are termed as derived quantities. Examples of derived quantities are Area, Volume, Speed, Force, Work etc.

SCALAR QUANTITY: A physical quantity which can be expressed only by magnitude (By a numerical value) is known as scalar quantity. Mass, Time, Temperature, Speed, work are scalar quantities.

VECTOR QUANTITY: Those quantities which need both magnitude and direction to express the quantity completely and also follow the laws of vector algebra are the Vectors.

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