Answer to Question #50116 in Mechanics | Relativity for tresh

Question

Lift
Lift on an aeroplane wing results from:

1. locally reaching the speed of sound in the boundary layer of the upper face of the aerofoil

2. a pressure difference between the faces of the aerofoil

3. a local increase in density at the upper face of the aerofoil

4. creating micro-vortices on the upper face which decrease the viscosity of the fluid