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A Little Something To Read..

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Posted by Bruce on February 16, 2001 19:48:13 UTC

The modern interpretation of mass is an invariant quantity. Its the same in all coordinate transformations. So when an object is in motion it gains kinetic energy and its total energy increases but its invariant mass remains the same. Here is a short explanation which also covers the confusion between relativistic mass (old term which is the same as total energy) and the invariant form.
http://math.ucr.edu/home/baez/physics/mass.html
http://www.physics.purdue.edu/~hinson/ftl/html/FTL_part1.html#sec:eandp

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