Sunday, August 17, 2014

classical mechanics - Why is the d'Alembert's Principle formulated in terms of virtual displacements rather than real displacements in time?



Why is the d'Alembert's Principle formulated in terms of virtual displacements rather than real displacements in time?


EDIT In other words, which step of the derivation of D'Alembert's principle (or Largrange's equation) will not work if one uses real displacements and why?




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