Acceleration and gravity are entirely interchangeable. The feeling you get due to gravity is also because of something "pushing against you" - namely, the groun

Acceleration and gravity are entirely interchangeable. The feeling you get due to gravity is also because of something "pushing against you" - namely, the ground. If you didn't have the ground to push against, nor air to drag against you, you'd be in free fall, which is the same as being in zero gravity.