Force is the derivative of energy. Energy is a quaternion consisting of a scalar part and vector part E= Es + Ev. This gives five different forces: XE = (d/dr + Del) (Es + Ev) = (dEs/dr - Del.Ev) +...
Gravity, Friction, Air resistance, Turning, Moments, pressure, upthrust, balanced forces, unbalanced forces.
there are some of the forces that are well known.