On 5/28/2025 3:24 AM, Alan Grayson wrote:
On Wednesday, May 28, 2025 at 4:16:41 AM UTC-6 John Clark wrote:
On Tue, May 27, 2025 at 6:21 PM Alan Grayson <[email protected]>
wrote:
/> If t isn't a clock reading, then why would anything move? AG /
*What physicists call"Proper Time" is a specificclock reading,it's
what you see when you look at _your_ wristwatch. And if no force
has been applied to enhance your motionthen the path you are
following through 4D spacetime is a geodesic. And the amount of
time it took you to travel through space from point A to point B,
as determined by your wristwatch, will be longer than the proper
time of anybody else, as determined by _their_ wristwatch, who HAS
had an external force applied to them and thus are _not_ on a
geodesicpath through 4D spacetime.*
So, if a test particle is spatially at rest, which presumably is
non-geodesic motion in spacetime, what causes it to move spatially
when the force holding it spatially at rest, is released? AG
"Spatially at rest"?? It's called *Relativity* Theory for a reason.
Everything's at rest in it's own frame. *Force-free* motion is geodesic
motion. So when all force goes away the particle follows a geodesic.
Brent
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