3/27/2023 0 Comments Gravity force![]() One of the predictions that comes out of a detailed, formal, analysis of Einstein's elevator is that clocks on the floor of Einstein's elevator do not tick at the same rate as clocks on top of the elevator. There are several flavors of how the principle of equivalence works, this is just a short and not very detailed summary. ![]() The motivation for considering the two cases, the force one feels in an accelerating elevator, and the force one feels due to gravity, as being equivalent is usually called "The Principle of Equivalence". This is commonly called "Einstein's elevator". In order to incorporate gravity into special relativity, Einstein considered what the reference frame of an accelerating rocket or elevator would act like according to the theory. I'll address a few things you haven't mentioned, though. You've already given a good lay summary of how GR works, congratulations on doing your research. There were several possibilities, but eventually Einstein came up with what is now called General Relativity as a way to incorporate gravity into the framework of special relativity. Then and now, though, the issue of how the special theory could possibly incorporate gravity remains. Einstein was concerned by this - there is now plenty of evidence that his special theory of relativity was correct. When Einstein created the theory of special relativity, he observed that the concept of Newtonian gravity was not consistent with special relativity. On the subject of gravity not being a force - if we are being constantly accelerated by standing on the surface of the Earth doesn’t that require some energy? If yes where does that energy come from? ![]() I then watched a video on quantum gravity that said gravity was a force (although almost infinitely weaker than the other known forces) and the theoretical particle is the graviton. If you fall into a hole you don’t experience a gravitational force pulling you down rather you feel the removal of the force that was pushing you away from your geodesic. Objects will follow a geodesic through spacetime and require a force to move them away from a geodesic - so the surface of the Earth is accelerating everything on the surface. ![]() I’ve watched a few videos recently that explained that gravity is not a force rather it is caused by time dilation because clocks tick slower closer to mass. Summary:: Conflicting opinions on videos I’ve watched ![]()
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