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

At 12:39 PM -0500 2/27/08, Ken Caviness wrote:
To summarize,

When force and velocity are perpendicular, F = gamma m a.
When force and velocity are parallel, F = gamma^3 m a.
The product (gamma^3 m) was at one time referred to as the "longitudinal
mass", as distinguished from (gamma m), the "transverse mass". To me
the non-existence of one simple "relativistic mass" covering all cases
is a good reason to join (or stay in) the "anti" camp.

If you start out with an error (there are two kinds of relativistic mass), you arrive at an erroneous conclusion ("the non-existence of one simple "relativistic mass""). Correct?

Tom Sandin