What is D'Alembert's Principle? For a system of mass of particles, the sum of the difference of👍 the force acting on the system and the time derivatives of the momenta is zero when projected onto any virtual👍 displacement.

A👍 theorem in fluid mechanics which states that no forces act on a body moving at constant velocity in a straight👍 line through a large mass of incompressible, inviscid fluid which was initially at rest (or in uniform motion).

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