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Quist, Oren wrote:
It depends upon your reference frame !
No, it doesn't. All accurate observers agree that momentum is conserved.
Always. Really and truly. This is true for special relativity as well
as Galilean relativity.
An external force will change the momentum -- N2!
OK, so what? Change is not the same as non-conservation.
I'll see your N2 and raise you an N3.
Momentum is conserved -- N3!
I don't think it is a matter of "constancy" or "conservation". I think
it is a matter of being careful to choose your reference frame.
Please show us a reference frame in which N3 is violated, i.e.
in which momentum is not conserved.
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