CEA Fundamentals Block 3 Practice Test

Increase of velocity increases which aerodynamic forces?

Lift and drag Lift only Drag only Neither

Correct Answer:

Lift and drag

Explanation:

Rising speed increases dynamic pressure, which is ½ times density times velocity squared. Both lift and drag depend on this dynamic pressure: lift is proportional to ½ ρ v^2 S C_L and drag is proportional to ½ ρ v^2 S C_D. So when velocity goes up, and the wing’s lift and drag coefficients don’t drop due to a change in angle of attack or other conditions, both forces rise with v^2. In short, faster flight increases both lift and drag (under typical conditions with the coefficients held constant at a given angle of attack).

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