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Quote from: jeffreyH on 12/02/2015 19:47:12In cases where we have well defined constraints, such as a circular orbital around a single perfect spherical mass or a particle traveling on a plane in flat spacetime, we can work with virtual displacements. The method can be studied here:http://en.wikipedia.org/wiki/Virtual_displacementI don't understand why you're talking about virtual displacements here. The only place I know of where they're used is in analytical mechanics, i.e. Lagrangian mechanics.
In cases where we have well defined constraints, such as a circular orbital around a single perfect spherical mass or a particle traveling on a plane in flat spacetime, we can work with virtual displacements. The method can be studied here:http://en.wikipedia.org/wiki/Virtual_displacement