Physics Forces, topic

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