First law of motion: It states that a body at rest or in motion will remain at rest or in motion unless an external force is applied on it.

Second law of motion: It states that a body will accelerates, when a force is applied on it.

The force applied, F = ma

Where 'F' and 'a' are vectors.

Third law of motion: It states that action and reaction are equal and opposite.

OR

For every action there is an equal and opposite reaction