On Wednesday, May 28, 2025 at 3:57:29 PM UTC-6 Brent Meeker wrote:
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 specific clock reading, it's what you see when you look at your wristwatch. And if no force has been applied to enhance your motion then 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 geodesic path 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 When sitting on your butt, you're spatially at rest! That force=free motion is geodesic, must be a posulate of GR, not something a particle wants to do, or knows the path to do. AG -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/6dcb90d5-055a-49e5-ad3d-53904dcfb9can%40googlegroups.com.
