A wing creates lift by imparting a downward momentum to the air flowing above and below it. The rate of change of momentum is equal to Force (Newton's 2nd law), and therefore a reaction force pushes the wing up, producing lift (Newton's 3rd law).
The imparting of this downward momentum ("downwash") to the air results from an air pressure differential above/below the wing. If you know the pressure above the wing and the pressure below the wing, and the wing area, you can calculate the lift force on the wing since Force = Pressure x Area. If you don't know the pressures, you can get a rough estimate if you know what the average air velocities are above and below the wing. A wing creating lift will have higher speed air flowing over the top of it than flowing below it. By employing Bernoulli's Principle, you can calculate a pressure difference corresponding to the difference in velocity.
An airfoil shape is effective in generating lift since it helps to keep the air flowing smoothly around the wing, making the wing more effective in diverting the air downwards. Air tends to flow more smoothly around curved shapes rather than abrupt sharp edges which is why the top of an aircraft wing always is curved. Even a perfectly flat wing can create lift (such as in a toy balsa wood glider). However a flat wing isn't practical for a full sized airplane since it's not quite as effective in producing lift as a curved airfoil. At larger scales air behaves less like a viscous medium and more like an inertial one, meaning it doesn't like to hug sharp turns over an object. So for a full scale flat wing the air wouldn't flow smoothly past the sharp leading edge, resulting in a loss of lift, a lot of drag and an abrupt stall.
Note that there is no requirement that the air molecules separating at the leading edge and flowing below the wing meet up with the same molecules that flow over the top. This is called the "equal transit time theory" and is a popular science myth that unfortunately has found it's way into flight manuals and even some undergraduate texts. However, aerodynamics engineers have known ever since they started doing wind tunnel testing that the air flowing over a lifting wing reaches the trailing edge sooner than the air below it. This is true even for a perfectly flat wing. This can be explained in terms of the circulation theory, which is an advanced concept.
Lift
The pressure above the wing be Save comes less than the pressure below the wing.
Lift.
LIFT -- force provided by the wing and in perpendicular direction to the wing. In straight and level flight the lift is exactly equal to the aircraft weight. WEIGHT -- the force pulling vertically down on the airplane due to gravity. In straight and level flight this is equal to the lift. THRUST -- the force that pulls the airplane forward, provided by the propeller or jet engine. If the airplane is flying at a constant speed in level flight, this thrust is exactly equal to the drag. DRAG -- the aerodynamic force on the airplane in the opposite direction of its travel. Drag is due to skin friction, form drag (drag around wheels, struts, etc) and induced drag (produced by the wing as a side effect of lift)
It's called "lift" and is the difference in air pressure between above and below the wing.
Air moving over the rotor disk, much like an airplane wing.
Lift
Yes because an airplane wing has to cut through wind and create loft and lift.
The pressure above the wing be Save comes less than the pressure below the wing.
Lift.
Thrust is the forward motion of the airplane provided by the engines. Lift is the upward force on an airplanes wing.
Faster. This is how lift is produced over the surface of the wing because the pressure is decreased over the top surface Lift=Coefficient of lift x 0.5density of air x speed (squared) x surface area.
Lift.
Greater lift
Basically they 'curve' the wing, forcing the airflow to lift more weight.
They help produce more lift by the wing. Lift is dependant on the formula L=CL x1/2densityx speed (squared) xsurface area So the greater the surface area the more lift produced. Flaps can extend from the front of the back of the wing. They also change the curvature of the wing thus producing more lift as well. They are used for takeoff and landing because they allow the wing to produce more lift at a slower speed.
The air on top of the wing is at a lower pressure than the air at the bottom of the wing so wing is pulled upwards