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For a particular interval of time t, the force is described as the frequency of change of momentum. It is hard to compute the rate of change if the time interval is minor. There the term, average force makes an entrance.
Over a period of intervals (Δ t) the rate of change of momentum is Average Force. It is given by
F = m (vf – vi)/Δ t
Where,
the mass of the body is m,
the final momentum is vf,
the initial momentum is vi,
the change in time is Δ t.
The Average Force Formula aids one in getting the rate of change of momentum for any number of time intervals (Δ t). Expressed in Newton (N).