Vector Quantities: Vector quantities refer to the physical quantities characterized by the presence of both magnitude as well as direction. For example, displacement, force, torque, momentum, acceleration, velocity, etc.
Linear displacement, Linear velocity and Linear acceleration all of these are vector quantities.
According to Newton's first law of motion every body continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force.
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as Newton's second law of motion
The mass is a matter contained in a body. Mass is expressed in kilogram (kg).
The weight of a body is a force by which it is attracted towards the centre of the earth. Weight is expressed in Newtons (N).
The relation between the mass and weight of a body is given by W = m.g
When a body falls freely under gravitational force, it possesses no weight.