On Wednesday, February 20, 2019 at 7:50:51 PM UTC-7, Brent wrote: > > > > On 2/20/2019 1:23 PM, [email protected] <javascript:> wrote: > > > > On Wednesday, February 20, 2019 at 12:16:31 PM UTC-7, Brent wrote: >> >> >> >> On 2/20/2019 8:42 AM, [email protected] 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 >
*Other than gravity, the remaining known forces are moderated, or shall we say "caused by" particles. Doesn't GR remain an exception; that is, wouldn't it preclude the existence of a graviton? TIA, AG * > > > >>> *> what causes "motion" from that pov?* >>> >>> >>> Force, same as with Newton. >>> >>> John K Clark >>> >> -- >> 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 post to this group, send email to [email protected]. >> Visit this group at https://groups.google.com/group/everything-list. >> For more options, visit https://groups.google.com/d/optout. >> >> >> -- > 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] <javascript:>. > To post to this group, send email to [email protected] > <javascript:>. > Visit this group at https://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/d/optout. > > > -- 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 post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
