The exam question that the OP refers to is ridiculous. Definitely one just to learn the answer for the exam and then forget about.
Genghis and Shaggy - you're discussing different things. "Stick" is no good for learning about the science of aerodynamics, but is brilliant at getting across enough info for a pilot to understand what s/he needs. You don't need to understand the detail of how a car works in order to drive one safely - but you do need to know a little bit about how it works: flying is the same.
Neither "Stick" nor a good aerodynamics text book will help answer the OP's question though.
No one has mentioned Bernoulli yet...