Pakistan study notes for Matric, Intermediate, B.A, B.COM BSC, M.A, BCS. Free Pakistani Urdu educational school, colleges and University notes.

TYPES OF PHYSICAL QUANTITIES – Scalars Quantities, Vector Quantities

TYPES OF PHYSICAL QUANTITIES:

Physical quantities are divided into two types:

  1. SCALARS
  2. VECTORS

Scalars Quantities:

“Physical quantities which can completely be specified by a number (magnitude) having an appropriate unit are known as “SCALAR QUANTITIES”

 

Scalar quantities do no need direction for their description.

Scalar quantities are denoted by letters in ordinary type.

Scalar quantities are added, subtracted, multiplied or divided by the simple rules of algebra.

Examples:

Work Density
Energy Mass
Volume Distance
Time Temperature
Speed Refractive index
Power Electric Charge

Vector Quantities

“Physical quantities having both magnitude and direction with appropriate unit are known as “Vector Quantities”.

 

We can’t specify a vector quantity without mention of direction

Vector quantities are expressed by using bold letters with arrow sign such:

 

As:

 

Magnitude of vector is represented by only alphabets without arrow.

Vector quantities cannot be added, subtracted, multiplied or divided by the simple algebraic method.

Vector quantities added, subtracted, multiplied or divided by the rules of trigonometry and geometry.

Examples:

Velocity                                   Displacement

Force                                      current

Momentum                             Weight

Torque                                    Momentum

Acceleration

Related posts:




Leave a Reply

Content Protected Using Blog Protector By: PcDrome. & GeekyCube.