- #36
PAllen
Science Advisor
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I disagree. I see him using inertia here qualitatively, not specifying any expression for it. It says a lot of force is needed for a small change in speed, and does not derive anything about the quantitative relationship between force and acceleration. Also, his example happens to be one where force is orthogonal to velocity, which is the one case when relativistic mass behaves like inertia.atyy said:That fact is derived as a consequence of Eq 15.10 (and the preceding equation).