SCALAR QUANTITY AND VECTOR QUANTITY

 SCALAR QUANTITY AND VECTOR QUANTITY

Easy Explanation

Quantity –

Anything which is expressed in numbers known as Quantity. 

For Example: Ages of man and women ( 3 years, 4 years etc ), population ( 2 lac, 10 lac, 30,000 etc)

Physical Quantities :

 All quantities which are expressed in terms of law of physics know as physical Quantities. Examples :- Mass, Length, Displacement, Distance, Momentum and electrical current etc. Physical Quantities can be divided further in two types.

1) Scalar Quantities – 

Those quantities who have only magnitude.
Magnitude means just mathematical value. It is always  some numbers. For example – 20 kg, 10km/hr, here 20, 10 are numbers. kg and km/hr are the units.
So such quantities known as Scalar Quantities.
Examples of Scalar Quantiites- Mass, Temperature, Density, Volume, Work, and Electric Current etc.

2) Vector Quantity –

 Those physical quantities who have both magnitude and direction. Vector represented with directed line segment ( → )
Examples of Vector Quantities – Velocity, Acceleration, Displacement, Linear Momentum, Torque.

Note – A quantity which has both magnitude and direction but doesn’t follow vector law of addition and subtraction is not a vector quantity.
For example: electric current, work, pressure etc.

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