OK Thanks Id like you to focus specifically on that last edit that was deleted by Wolfkeeper Im sure that was just a malicious act  A marble sits in a radial groove in a rotating turntable You will agree with me that centrifugal force will cause the marble to roll outwards  I am up against people who are trying to deny this Note in particular PhySusie who states that there is no need for any outward radial force  How do you argue against people like that Are they genuine Did she just come in to back up Wolfkeeper She said so many things wrong that even Itub openly disagreed with her That of course wasnt her aim so she immediately set herself right with Itub and then twisted it around to make it my fault by insinuating that I hadnt described the situation clearly enough She interpreted my term radial groove to be curving outwards Radial means radial  Itub himself clearly understood the picture but he is trying to argue that the centrifugal foce in question only exists for observers on the rotating turntable  It exists full stop The marble rolls radially to the edge of the turntable We can all see it no matter whether we are spinning or what