Abstract
Single-spatial dimension intrinsic identities involving a particle's own-acceleration and observer-perceived acceleration, permit ‘spatial momentum’—a parameter defined as m dx/dτ—and its spatio-temporal complement m dt/dτ—relabelled ‘temporal momentum’ in place of the misnomer ‘relativistic mass’—to reflect force's traditional link between classical momentum and kinetic energy. Energy conservation confirms the relativistic force parallel and leads directly to the mass–energy formula.
Published Version
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