From: louisnews Newstrom (louisnews@comcast.net)
Date: Sat Aug 24 2002 - 21:04:07 MDT
Einstein's words:
> "By the 'special principle of relativity' is
> meantthe generalization of this definition [definition of an
> inertial system]
> to include any natural event whatever: thus, every universal law
> of nature
> which is valid in relation to a coordinate system C, must also be
> valid,as it stands, in relation to a coordinate system C', which
> is in uniform
> translatory motion relatively to C."
This quote only says that all laws of physics are valid in all frames
of reference. There is nothing here (or anywhere else) that says that
any force of nature must effect any two objects equally.
Dingle:
> > > 1 - According to the postulate of relativity, if two clocks
> > > separate and re-unite, there is no observable phenomenon
> > > which may show, in an absolute sense, that one, rather than
> > > the other, has moved.
Relativity says that because there is no preferred frame of reference,
you cannot tell which clock is moving and which is standing still in
any INTERTIAL FRAME.
The key here is INTERTIAL. If the clocks are moving, but neither one
changes speed, then yes, you could not tell which is which. As soon as
one accellerates, it is NON-INTERTIAL, and all observers will agree
which clock is accellerating.
Dingle's example strays from the simple example of two objects moving
with respect to each other. He has one accellerate, turn around, and
come back. This is the key. All observers will agree which clock
accellerated. All observers will agree that that clock should be
slower.
--- Louis Newstrom louisnews@comcast.net
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