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Noether's Theorem relates continuous symmetries (continuous transformations that keep the theory's action invariant) to conservation laws. It finds many applications in modern Physics and generalizes the common notions of conservation of energy, momentum, and angular momentum of Newtonian Mechanics.

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Origin of momentum. Noether's theorem

My professor talked about Noether's theorem and how translation is the origin of momentum conservation. But why is it not velocity that is conserved but mass times velocity. And on the same note why …
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