The cross-sectional shape of an airplane wing is called an airfoil. It is curved, and has a rounded leading edge and a sharp trailing edge. Due to the airfoil, air passes above the wing faster than air passing below. Faster-moving air has a lower pressure than slower-moving air. This difference in pressure generates lift, forcing the wing upward.

The amount of lift changes depending on the angle of attack. The angle of attack refers to the angle between the chord line (imaginary straight line connecting the leading and trailing edges) of the airfoil and the direction of the airflow. As the angle increases, the lift also increases.



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