Discussion
Consider the following pairs of force and character.
Pressure gradient - real
Coriolis - apparent
Friction - real
Centrifugal - real
How many of the pairs given above are correctly matched?
Answer: A
The last pairing fails: the centrifugal force, like Coriolis, is an artefact of the rotating frame and has no source in any physical interaction. The other three are correctly classified. In the standard formulation the centrifugal force of the Earth's own rotation is folded into effective gravity, which is why it seldom appears explicitly, though the centrifugal effect of curved flow does appear in gradient wind balance.
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