True Flight

Which of the following statements is true about an airplane wing during flight?

-Air above the wing travels faster than air below the wing
-Air below the wing travels faster than air above the wing.
- The wing exerts pressure equally in all directions.
- The lift acting on the wing reduces the weight of the wing.

To answer this question there are two principles of physics involved and to really understand it is a little difficult.
The shape of the wing determine the lift on the wing. The birds know it very well they know how to fly.
By making the top of the wing a curves and the bottom a straight line,we obtain two different traveling distances for the air fluid to flow.The angle which the fluid flows is called the angle of attack and in order to fly the airpla must have the proper andgle of attack least it stalls.

Bernoulli's principle says that if the velocity of the moving fluid is increased the pressure is decreased.

The velocity of air over the top of the wing is greater than the air flowing under the wing.Because the air travels a longer distance for the same time as the air floweing below the wing.Hence the pressure is less on top of the wing.

By Newton third law the bottom of the wing gets the greater lifting power.
Therefore the statement in the first line of you question is correct.
So the plane mimics the flight of a bird.