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Let me defend a naive position. It is a risky busines but what do I have
to loose? I am saying that a cetrifugal force is real, as far as a bead
mounted on a rotating stick is concerned. The stick is horizontal and turns
about a vertical axis. Suppose I am that bead and I experience acceleration
with respect to the beam on which I am sitting. I am gaining speed while
sliding away from the axis of rotation. What is wrong with saying that m*a
is the centrifugal force? It is very real in my rotating frame, it can hurt
by making me dizzy, etc.