Re: Acceleration and the twin paradox

From: Daryl McCullough (daryl_at_atc-nycorp.com)
Date: 06/03/04 

Date: 2 Jun 2004 20:05:14 -0700

greywolf42 says...
>
>Daryl McCullough <daryl@atc-nycorp.com> wrote

>> Just so that I understand what you're saying, let me ask a question:
>> do you believe that *Newtonian* physics requires an aether?
>
>Newton's three equations of motion and his empirical equation of motion do
>not require an aether.
>
>> If not, why not?
>
>Because, in the first three, Newton did not postulate that the aether
>affected motion of bodies.

But Newton's laws give a special place for inertial reference
frames, just as SR does.

>> Newtonian physics treats inertial frames specially, just
>> like Special Relativity does.
>
>A false claim. Newtonian physics says nothing whatsoever about inertial
>frames.

It doesn't matter whether the *phrase* "inertial phrase" appears.
Newton's laws of motion depend on inertial reference frames in
an analogous way that Special Relativity does. In particular,
the law that

   (d/dt)^2 x^j = 0

for force-free motion holds *only* if the coordinates x^j
are measured in an inertial frame. In noninertial coordinates,
the laws of motion are more complicated. 

--
Daryl McCullough
Ithaca, NY

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