Discussion
Which of the following is not one of the forces appearing in the horizontal equation of motion?
Buoyancy
Pressure gradient
Coriolis
Friction
Answer: C
Buoyancy arises from the vertical equation as the residual left when hydrostatic balance is subtracted, and it has no horizontal counterpart. Pressure gradient, Coriolis and friction are the three terms of the horizontal equation once the centrifugal force has been absorbed into effective gravity. Keeping the horizontal and vertical force inventories separate prevents a common confusion when the equations are first written out in full.
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