- #71
Mister T
Science Advisor
Gold Member
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I agree. Inertia is not a well-defined quantity in SR.Orodruin said:You don’t really. Inertial mass is a concept of classical mechanics.
Yes, but why are you using the term "inertia" when speaking about relativistic concepts?Orodruin said:In relativity ”mass” generally refers to rest energy. To me, the real beauty of ##E = mc^2## is that the rest energy is equal (with c=1) to a system’s rest frame inertia. Thereby justifying the use of the word “mass” for the rest energy.