3 ms·Normally when discussing mass, people are referring to resting mass, not relativistic mass.by gnaritas 9y agoNormally when discussing mass, people are referring to resting mass, not relativistic mass.posterboy 9y agonormally, people don't discuss mass. rather they are simply heavy. most don't even really care why. and those who do, conflate the idea with weight often enough.gnaritas 9y agohaha, very true.