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The centrifugal force, fictitious to me but very real in the
rotating frame, would act on the bead ... as it
slides away from the axis of rotation.
It is the only force acting on
the bead, like gravity in free fall.
The object is experiencing "artificial
gravity" directed away from the axis of rotation.
But why should the same be true for somebody who is not in contact
with the rigid structure of the rotating pipe?
An object half way between
the axis and the wall will not experience any radial pull toward the
nearest wall.
Is it correct to say that artificial gravity exists only for
objects which are forced to rotate together with the pipe (like in a
centrifuge), it does not exist for all objects inside a rotating empty pipe?