sci.physics.electromag

On Mar 21, 6:55=A0pm, "Robert J. Kolker" wrote:
> maxwell wrote:
>
> > Benj, there is another concept that justifies why things move apart
> > from 'force'. =A0Just to make this interesting, check out p.19 of the
> > Principia (transl. Motte, Prometheus) & remember, Newton wrote in
> > Latin, so his original word was 'vis' that today is translated as
> > 'force' but modern physics (like Newton) has another term.
>
> Vis also means energy or action.
>
> But all this is bafflegab. We resolve the meanings by using mathematics.
> Force is the change of momentum (what Newton called motion) in time.
>
> F =3D dp/dt. This is true classically and relativistically.
>
> Bob Kolker
Well done, Robert. You have passed Question 1 in the Into-to-Physics
exam. If you continue with this perfect repetition of of what you
have read you will be awarded a PhD in about 10 years. There may even
be still some openings for you in theoretical physics at a few
universities.