Scalars and vectors

what is scalars

                  Physical quantities like as length, area, volume and mass can be completely
described by a single real number. therefore,  these quantities are describable by giving
only a magnitude, they are called scalars.then we can says
                          "Physical quantities which require only magnitude are called scalars".
Examples: length, area, volume, mass, density, pressure,work,power, etc. 

what is vectors

               Physical quantities like as displacement, velocity, force and acceleration require both a magnitude and a direction to completely describe them.  Such quantities are called vectors.then we can says
                           "Physical quantities which require both magnitude and direction for their complete
description  are called vectors".

Examples: Displacement, velocity, acceleration, torque, momentum, force, weight, etc.

Representation of vectors :

                   vectors are  represented by two ways.
                    1. Symbolically.
                    2. Graphically.

Symbolic Representation:

                    A vector is represented by a letter with an arrow drawn above or bellow it.In books vector are represented by bold faced letters.

Graphical Representation:

                   Graphically, a vector is represented by directed line segment with an arrow head.The length of line corresponds to the magnitude of the vector.

physics, Scalars and vectors