Philosophy Lexicon of Arguments

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Feynman, Richard
 
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Ostension I 191
Showing/Evidence/Feynman: what actually means "show that something is true"? We find out directly from Newton's law that the kinetic energy should change when we form its derivative by time, and then apply Newton's law.

dT/dt = d/dt(1/2mv²) = 1/2m2v (dv/dt) = mv (dv/dt)

From the 2nd Newtonian law, however, follows m(dv/dt) = F such that

dT/dt = Fv.

in the one-dimensional case, it is force times speed.

Fey
R. Feynman
Vom Wesen physikalischer Gesetze München 1993

Fey I
R. Feynman
Vorlesungen über Physik I München 2001


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Ed. Martin Schulz, access date 2017-04-25