Gravity is the force between any object and the Earth.

The force due to gravity acting on an object is called its weight (\(W\)), and acts downwards.

A body in free fall experiences an downwards acceleration of \(g\) = 9.8 ms^-2.

Using \(F = ma \), the equation of motion for an object of mass \(m\) kg with weight \(W\) N is:

\(W = mg\)