system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
What causes an airplane wing to fly?


assistant
As Bernoulli's principal explains, because of the shape, air moving across the curved upper surface on top of the wing will travel faster and thus produce less pressure than the air moving more slowly along the flatter bottom of the wing's surface. This imbalance of high and low pressures results in a force called lift which is applied in the direction of the lower pressure.