In most books on classical mechanics, Noether's Theorem is only formulated in conservative systems with an action principle. Therefore I was wondering if it is possible to also do that in non-conservative systems? It would be pretty cool if you could at least get the conservation of momentum (which is valid also in non-conservative systems if there are no external forces because of Newton 3) from translation symmetry and conservation of angular momentum (which is also valid in non-conservative systems as long as there are only central forces) as a consequence of rotation symmetry in non-conservative systems. If that is not the case, is there any way to extend Hamilton's principle or the generelization of it ($\int (\delta T + \delta W) dt = 0$, see for example Sommerfeld) so that it also covers Newton 3 (also maybe that's a topic worthy of its own question)?



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