Why is there no such thing as centrifugal force?
That is because this "force" appears only if you are
in a rotating frame of reference. If you were in an
inertial frame this force can be understood as inertia.
Therefore the centrifugal force is a pseudo force, and
not a real force.
An inertial frame is one which is at rest with respect to the
the distant stars. A frame moving uniformly with respect to
such a frame is also an inertial frame of reference.
jasjeet s bagla
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Update: June 2012