= D'Alembert's principle
{wiki=D'Alembert's_principle}
D'Alembert's principle is a fundamental concept in classical mechanics that provides a powerful tool for analyzing the motion of dynamic systems. Named after the French mathematician Jean le Rond d'Alembert, the principle can be seen as a reformulation of Newton's second law of motion. In essence, D'Alembert's principle states that the sum of the differences between the applied forces and the inertial forces (which are proportional to the mass and acceleration) acting on a system is zero.
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