Richard Feynman schreibt zum Newtons Zweiten Gesetz der Dynamik in seinem Werk „Lectures on Physics“ (Kapitel 15):

For over 200 years the equations of motion enunciated by Newton were believed to describe nature correctly, and the first time that an error in these laws was discovered, the way to correct it was also discovered. Both the error and its correction were discovered by Einstein in 1905.

Newton’s Second Law, which we have expressed by the equation

\[ F=d(mv)/dt \]

was stated with the tacit assumption that m is a constant, but we now know that this is not true, and that the mass of a body increases with velocity. In Einstein’s corrected formula m has the value

\[ m=\frac{m_0}{\sqrt{1-v^2⁄c^2}} \]

where the rest mass  represents the mass of a body that is not moving and c is the speed of light […]”.

In der Tat, wenn in der Gleichung des zweiten Gesetzes der Dynamik die Masse m durch die Formel  der relativistischen geschwindigkeitsabhängigen Masse ersetzt wird, ergibt sich nach der Differenzierung der Ausdruck der relativistischen Beschleunigung (siehe Herleitung).

Der Text von Richard Feynman fährt mit der Aussage fort:

For those who want to learn just enough about it so they can solve problems, that is all there is to the theory of relativity-it just changes Newton’s laws by introducing a correction factor to the mass.”

Genau das beschreiben wir auf dieser Website (siehe “Abfolge der relativistischen Herleitungen“).

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