• # Revision:Newtons laws of motion

TSR Wiki > Study Help > Subjects and Revision > Revision Notes > Mathematics > Newton's Laws of Motion

## 1st Law

• An object will stay in a state of rest or in uniform motion unless acted on by an external force.

## 2nd Law

• The force acting on a body is directly proportional to the mass of the body and its acceleration and is in the direction of the acceleration.
• Force = Mass x Acceleration

For A Level maths and physics the following may also be useful:

The resultant force acting on a body is directly proportional to the rate of change of momentum of the body, and acts in the direction of the momentum change.

This can be mathematically notated as , which is equal to , as .

## 3rd Law

• To every action force, there is an equal and opposite reaction force.

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