The above is just referring to the fact that the standard “feather vs. bowling ball” question assumes the earth/moon/ground is immovable. In that case, Newton says they fall the same.
The fact that the ground is not immovable is what’s being referenced — in this picture, things don’t “fall,” they are each accelerated towards each other.
The above is just referring to the fact that the standard “feather vs. bowling ball” question assumes the earth/moon/ground is immovable. In that case, Newton says they fall the same.
The fact that the ground is not immovable is what’s being referenced — in this picture, things don’t “fall,” they are each accelerated towards each other.