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Referring to:
... For example, in the rotating frame of reference the bob
of a conical pendulum moves in a fixed plane (PHI=const).
Leigh Palmer wrote:
That's incorrect. The bob of a conical pendulum is in
equilibrium, at rest, in the only rotating frame that
makes sense.
I am sitting on a horizontal platform which rotates below
the bob. The axis of rotation coincides with the line along
which an inertial observer A would see the bob hanging
in equilibrium. As far as I am concerned (observer B) the
bob is swinging in the vertical plane. To me it is a simple
pendulum to A it is a conical pendulum. The bob is not
at rest in my frame, that frame makes sense to me.