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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