The principle of physical independence of forces states that the effect of a force on a body is not affected by the presence of other forces. Each force has its own influence as if other forces were absent. Therefore, when multiple forces act on a particle simultaneously, the resultant of these forces will have the same effect as produced by all the forces. The principle of transmissibility of forces states that the equilibrium or motion conditions of a rigid body will remain unchanged if a force acting at a given point is replaced by a force of the same magnitude and direction, but acting at a different point with the same line of action.
