Summary

Net force equals \vec F_{net}=\frac{\Delta \vec p}{\Delta t}
Impulse is average force over time interval: \vec J = \vec F_{avg}\Delta t
Impulse-momentum theory is impulse = change in momentum: \vec J=\Delta \vec p = \vec p-\vec p_0
Integral of a force vs time graph equals impulse, slope of momentum vs time graph = net force
Impulse units are N * s (kg * m/s)
When mass is constant F=ma comes from Impulse-Momentum theory