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 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 **

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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**.

The **momentum** is defined as the total motion possessed by a body.

Mathematically, **Momentum** = Mass x Velocity

In Projectile

* A path, traced by a projectile in the space, is known as trajectory.

* The velocity with which a projectile is projected, is known as the velocity of projection.

* The angle, with the horizontal, at which a projectile is projected is known as angle of projection.