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d'Alembert's principle

/French dalɑ̃bɛr/
(physics) the principle that for a moving body the external forces are in equilibrium with the inertial forces; a generalization of Newton's third law of motion
Word Origin
C18: named after Jean Le Rond d'Alembert (1717–83), French mathematician, physicist, and rationalist philosopher
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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