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Do you know how the centripetal force can be
explained in a stationary (laboratory) frame? If you
do then please share your logical sequence. It is
not hard to explain that a centripetal force, of some
kind, must exist to account for the centripetal (v^2/r)
acceleration. But it is hard to identify that force in
some specific situations, for example, when an
object is sliding vertically inside a looping track.
If it is not an N3 reaction force then what is it?
Ludwik Kowalski