On 2/20/2019 1:23 PM, [email protected] wrote:
On Wednesday, February 20, 2019 at 12:16:31 PM UTC-7, Brent wrote:
On 2/20/2019 8:42 AM, [email protected] <javascript:> wrote:
On Wednesday, February 20, 2019 at 7:09:10 AM UTC-7, John Clark
wrote:
>/Newton "explained" /
Why did you put explained in quotation marks? If you can
predict what something is going to do then you've explained
it, the better the prediction the better the explanation. I
don't know what else the word could possibly mean. And in
science no explanation is perfect, but some are less wrong
than others.
*QM better illustrates the justification for quotes. Many
interpretations that make the same predictions. AG *
/> why a body at "rest" can start moving, via the
application of "force"/
And Einstein explained that a body moving in a geodesic
through 4D spacetime will take a path that is not a geodesic
if a force is applied. The Earth is moving in a straight line
(aka a geodesic) through curved spacetime; the reason Earth's
orbit looks elliptical to us is due to map distortion, the
same reason that in a flat map of the curved surface of the
Earth Greenland looks larger than South America and is almost
as large as Africa. Except that it's even worse, in one we're
projecting the 2 D curved surface of the Earth into the flat
2D surface of the map, but with Einstein we're projecting a
curved 4D volume into a flat 3D volume.
/> What does "rest" mean in GR /
In General Relativity moving in a geodesic is as close as you
can get to the traditional idea of rest, but as long as time
passes you're going to be moving through 4D spacetime.
*If you're at spatial rest in spacetime in the presence of a
gravitational source, how does GR explain the subsequent spatial
motion? AG
*
When you were at "spatial rest" you had a force applied to you.
Removing it allowed you to follow a geodesics path through
spacetime....also known as "falling".
Brent
*So it seems that GR doesn't explain motion; rather, it assumes motion
is a natural state of things. AG
*
So called "standing still" is just motion in the time direction
only...in Newtonian and special relativity as well. Just as there is no
absolute motion, there's no absolution motionless either...it's called
"relativity" for a reason.
Brent
/> what causes "motion" from that pov?/
Force, same as with Newton.
John K Clark
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