I was debating a variation of this Phys.SE question with a friend. The original question is:
"If you had your eyes closed, could you distinguish between standing still on earth and being in a spaceship which is constantly accelerated at 1g?"
Yes. When you are "standing still" on earth, you actually have velocity due to the fact that the earth is spinning. If gravity suddenly disappeared, you would fly off into space in a straight line, according to your velocity. Since you remain on the surface, there must be a gravitational force constantly pulling you down, constantly changing the direction of your velocity (velocity has both magnitude and direction). Acceleration is defined as the change of velocity, so as you are "standing still", you are actually being constantly accelerated. Now the question has been reduced to "does being accelerated in space feel the same as being accelerated on earth?"
What if the earth and all other objects in space were standing still? You could still feel the earth's gravitational pull. Would it feel different than being accelerated in space?
I imagine being accelerated feels different than not being accelerated. I also imagine you can feel a gravitational pull of a planet even if it is not spinning. This is about all I could muster.