In reply to Vibrator !'s message of Sat, 2 Jul 2022 01:41:55 +0100: Hi, >> Every moving thing on the planet does the same thing. However the net effect >> is >> zero.. > >Reciprocity is obviously broken for effectively-reactionless >accelerations however. >Let me try restate the conundrum more clearly: > > gravity's a mutual attraction between masses / inertias as observed >from the zero momentum frame > > from within either inertial frame it's a uniform acceleration >(Galileo's principle) > > a hovering UFO exhibiting no reaction matter is nonetheless a >massive body in a gravity field, thus being accelerated downwards at 1 >G like anything else
This statement contains a couple of unproven assumptions. 1) You don't know that's is reactionless. 2) You don't know that it's being accelerated upward as well as being pulled down by gravity. It may actually be canceling the effect of gravity on the craft. After all, we don't really know anything about the actual nature of gravity, or any of the forces for that matter. We have a few constants and some nice formulae, but no real understanding of the actual nature of forces. E.g. why do like charges repel, and unlike charges attract? [snip] If no one clicked on ads companies would stop paying for them. :)
