3 ms·
There is acceleration. It just isn’t on you. The ground is accelerating upwards, which keeps it in place. You are not accelerating, and therefore you move down
by Filligree 2y ago
There is acceleration. It just isn’t on you.
The ground is accelerating upwards, which keeps it in place. You are not accelerating, and therefore you move downwards.
- TeMPOraL 2y agoWell, with me standing where I am, and anti-me standing on the exact opposite side of the Earth, the ground must be accelerating in opposite directions at once! It feels like taking a somewhat straightforward model and inverting it (in the x -> 1/x sense); that's how you get straight lines to split into pieces and curve away.
- Filligree 2y agoIt's forced if you start from the perspective of "General relativity describes reality", and obviously so if you look back at the inspiration for relativity, one of which was "there is no way to differentiate between different free-falling rest frames from inside a box". Of course it's not always the most convenient model, and there are ones in which gravity is indeed a force — the Newtonian approximation, for example — but the starting point of this article is "Here's how reality works if GR describes reality".