OK Thanks. I'd like you to focus specifically on that last edit that was deleted by Wolfkeeper. I'm 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 wasn't her aim so she immediately set herself right with Itub and then twisted it around to make it my fault by insinuating that I hadn't 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.