Why does the UA pick and choose what it accelerates?
It does not. It accellerates eveything equally in the known universe.
Umm... then why aren't we weightless?
If you are on a ship and on the leeward side of a sail, you would not feel the wind pushing on you but would still be traveling at the same speed as the ship.
You explicitly claimed "It accellerates eveything equally in the known universe",
Then you claim that things on the earth are shielded, but surely "eveything equally in the known universe" includes the "things on the earth".
And if these things "on the earth" are shielded, how high does this shielding go.
Polaris is not that far above the earth (3,000, 4,000 who knows) and is around 12,400 miles from the "edge" (but where is the edge?), so how is it shielded by the earth.
Seems all a bit hit and miss as to what gets "shielded" especially as no-one has any idea what sort of a force could push on the earth and push on the objects above the earth, providing exactly the same acceleration (not force) to each.
I know you have a hard time understanding a lot of things about physics. Probably the same for big words, like "leeward side." Perhaps you should simply leave the scientific discussions to the grownups and go play in the lower fora? We will let you know when dinner is ready.
As I said before it you asserted that "It does not. It accellerates
eveything equally in the known universe."
And, yes I obviously know what leeward (and, port, starboard etc) mean otherwise I would hardly have said that "Then you claim
that things on the earth are shielded, but surely 'eveything equally in the known universe' includes the 'things on the earth'."
I am trying to find out why
eveything equally in the known universe somehow excludes these things "shielded" by your "sail".
To me
everything equally in the known universe means
everything equally in the known universe.
And, yes I understand physics quite well, even a few bits of optics.
To put it bluntly, you have no idea what you are talking about with this guess about what gets "shielded" from this mysterious "force".
Somehow you are postulating a "force" which has to be proportional to the mass of the objects acted on, otherwise they would not be accelerated by the same amount. It is almost like a version of "anti-gravity" (your dark force pushes, gravitation pushes).
But to the best of our knowledge nothing can be shielded from gravitation.