[paulsutter]

Thats why I asked. And they are different.

If you throw a baseball in an accelerating enormous elevator in a vacuum, the baseball will follow a parabolic arc.

If you throw a baseball on the vacuum surface of a planet, it will almost (but not quite) follow a parabolic arc. The force of gravity is lower at the peak, unlike in the elevator where acceleration is constant everywhere in the elevator.

Therefore, you can distinguish gravity from acceleration