>>13347980Curved spacetime means you're never in an inertial frame, which means that gravity appears as a "fictitious" force just like the centrifugal force appears in accelerating frames. In 4D space, you're moving along geodesics - projecting that down to 3D space creates the illusion of acceleration. You can actually see this by noting that the four-acceleration is the curvature vector of the geodesic: if the geodesic is a straight line (space is not curved), there is no acceleration (no gravitational attraction).
