First law of motion: A body continues to be in its state of rest or of uniform motion in a straight line unless an external force is applied on it. The property due to which a material body resists the change in its state of rest or motion is called inertia. Hence, the law is also called the law of inertia.
Second law of motion: The rate of change of momentum of a body is directly proportional to the force applied on it and this change in momentum takes place in the direction of the applied force, i.e.,
F ∝ Δp/Δt ∆p
denotes change in momentum, ∆t denotes change in time.
The linear momentum of a body is the product of the mass of the body and its linear velocity. P = mv, m = mass, v = velocity
Third law of motion: To every action, there is always an equal and opposite reaction, i.e.
F12 = - F12