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Which force would remain if the Earth stopped rotating?

  • A.The pressure gradient force
  • B.The Coriolis force, which would continue to deflect the wind wherever the air was moving quickly
  • C.The centrifugal force
  • D.The apparent force associated with the curvature of the path followed by a moving air parcel

Answer: A

Pressure gradient, gravitation and friction are all real forces and would persist, while Coriolis and centrifugal forces, being consequences of rotation, would vanish. The atmosphere would then develop a direct thermal circulation from equator to pole with no westerly jets and no Rossby waves. Posing the question this way is a useful test of whether the distinction between real and apparent forces has actually been absorbed.

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