IMathAS-libretexts

A student is modeling the flow of air around an airplane wing, as shown in the figure. The model assumes that the air behaves like a fluid. Which of the following can exert an upward force on the wing?

The gravitational force on the wing,
The difference in the normal forces exerted on the wing by the air above and below the wing
The difference in the force exerted by the air hitting the front of the wing and the back of the wing
The frictional force between the air and the wing

License