Rocket Science

To really understand that gravity is acceleration, consider a rocket being launched.  The rocket experience huge acceleration upwards.  How is it unstable?  Its tail end tends to swing upwards, the top tip of the rocket sway from the vertical and it will rotating all the way.  Until it self-destructs.  Under gravity alone, a low C.G is stable, nothing topples over.  In high acceleration upward, the rocket will also topple - upwards!  A stable C.G is a high C.G, such that the tail end do not flip up.  A Rocket accelerating towards the heavens is as if gravity is upwards, a stable C.G is a high C.G.