On 2/19/2019 11:06 PM, [email protected] wrote:
On Tuesday, February 19, 2019 at 8:16:51 PM UTC-7, Brent wrote:
On 2/19/2019 5:10 PM, [email protected] <javascript:> wrote:
*What you wrote makes no sense. It fails to explain why motion
occurs in the absence of force. AG *
So did Newton: "A body in motion will remain in motion."
*Right, but Newton "explained" why a body at "rest" can start moving,
via the application of "force". What does "rest" mean in GR and what
causes "motion" from that pov? *
Same thing. Any body that have no forces on it is "at rest" in it's
own frame, just like in Newtonian physics...except that gravity is no
longer a force. So free falling bodies are "at rest".
Brent
*Incidentally, when I posed the question of why space and time must be
fused in relativity. I didn't know the answer. I came to a partial
explanation by posing the question. AG*
Brent
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