irishredfox Posted October 28, 2012 Share Posted October 28, 2012 I've been told that as a particle reaches the speed of light, the energy of the particle adds to the mass of the particle. I thought this would be a good place to start asking my questions, so here it goes: Would this apply to large objects as well? Why does energy add to mass? Link to comment Share on other sites More sharing options...
timo Posted October 28, 2012 Share Posted October 28, 2012 (edited) The mainstream view is more the other way round: Mass adds to the total energy. This is true for any speed of an object and indeed applies to large objects, too. But since many processes involving large objects leave the total mass constant, this is of practical irrelevance in many cases. Asking for a "why" is not exactly very physical. It seems to be a fact, so any argument against this would merely prove that nature cares little about human reasoning. If you mean "why" in the sense of "how can I make sense of it?" then I recommend considering mass as a form of potential energy. EDIT: And btw, this has nothing to do with Quantum Theory. Edited October 28, 2012 by timo Link to comment Share on other sites More sharing options...
mississippichem Posted October 28, 2012 Share Posted October 28, 2012 EDIT: And btw, this has nothing to do with Quantum Theory. Agreed. Moved to the relativity sub-forum. Link to comment Share on other sites More sharing options...
michel123456 Posted October 28, 2012 Share Posted October 28, 2012 (edited) The mainstream view is more the other way round: Mass adds to the total energy. This is true for any speed of an object and indeed applies to large objects, too. But since many processes involving large objects leave the total mass constant, this is of practical irrelevance in many cases. Asking for a "why" is not exactly very physical. It seems to be a fact, so any argument against this would merely prove that nature cares little about human reasoning. If you mean "why" in the sense of "how can I make sense of it?" then I recommend considering mass as a form of potential energy. EDIT: And btw, this has nothing to do with Quantum Theory. Bolded mine This is how I make sense of it: if I observe an object, say a planet, getting away from me at near the speed of light, I should observe its mass increasing. And reversely an observer on this planet should observe that the Earth is increasing in mass. Edited October 28, 2012 by michel123456 Link to comment Share on other sites More sharing options...
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