principle of virtual work
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.
Principal vs. PrincipleIs the head of a school called a principal or a principle? These two words are frustratingly similar, leaving even the most experienced English speakers to second-guess which word means what.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019