Final answer:
An airfoil creates lift by reducing the pressure on top of the wing and utilizing the conservation of momentum principle. This is due to the longer upper surface of the wing causing air to flow faster over it. Airfoils can also gain lift by pushing air downward.
Step-by-step explanation:
A shape created expressly to produce lift as it travels through the air is called an airfoil. An airfoil does, in fact, reduce the pressure on top of the wing, producing lift, or a net upward force. According to Bernoulli's principle, this is because the wing's longer upper surface causes air to flow over it more quickly. It's also true that airfoils can generate lift by using the conservation of momentum principle to push air downward. Newton's third law states that the deflected air molecules cause an upward force on the wing.