Discussion
Consider the following statements about apparent forces.
1. The Coriolis force appears only in a rotating frame.
2. The centrifugal force appears only in a rotating frame.
3. Both do work on the flow.
Which of the statements given above is or are correct?
Answer: C
Both Coriolis and centrifugal forces are consequences of describing motion in a rotating frame and vanish in an inertial description, so the first two statements hold. The Coriolis force does no work because it is perpendicular to the velocity, so the third fails. The centrifugal force is in any case absorbed into effective gravity in the standard formulation, which removes it from explicit consideration in the horizontal equations.
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