In+principle
131principle of superposition — Physics. any of several physical laws that the resultant of similar vector quantities at a point is a function of the sum of the individual quantities, esp. the law that the displacement at a point in a medium undergoing simple harmonic motion is …
132principle of virtual work — Mech. the principle that the total work done by all forces on a system in static equilibrium is zero for a set of infinitesimally small displacements. * * * …
