acroterion you yourself should be able to see the simplicity of the argument a marble rolling out to the edge of a rotating turntable along a groove is experiencing centrifugal force are you going to join those who are denying this fact because that is what it all comes down to it is too simple an issue to get out of by pleading ignorance when i see one person coming along and agreeing that centrifugal force is present in that situation then i will know that i am dealing with an honest person and i haven't found very many so far