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A contact force
When 2 objects are touching and a force is acting on them
Examples of a contact force
Friction, push/pull tension, air resistance and reaction force
Newtons 1st Law
An object will continue at rest or at constant velocity unless acted on by a resultant force (non zero force)
Newtons 2nd Law
A resultant force causes an acceleration
Equation for acceleration using force and mass
Acceleration (m/s^2) = force (N) divided by mass (kg)
Equation for acceleration using change in speed and time taken
Acceleration (m/s^2) = change in speed (m/s) divided by time taken (s)
Newtons 3rd Law
For every action there is an equal and opposite reaction, reaction pairs
Equilibrium
A stable situation in which forces cancel one another out
Note 
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