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Re: [Phys-l] Invariant mass and relativist mass...



|I get along very well telling my advanced
| students that F=ma is an approximation for F = dp/dt, and
| p=mv is an approximation for p = gamma m v. They _like_ the
| idea that they're getting, if not "the rest of the story", at
| least "more of the story".

I'd add, that even in introductory courses, where a momentum first
approach is being used, they often start with F = Delta p/ Delta t, and
not F = ma or F = m Delta v / Delta t.