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I think that a centrifugal force F is real; it can be measured. Suppose
a ring is sliding along a rotating stick. We expect F=m*a, where a is
the ring acceleration, with respect to the stick, directed away from
the center. One can measure static F (with a calibrated spring mounted
on the stick) and one can measure the acceleration (when the ring is
allowed to slide). What is wrong with this point of view?