What is lift in aviation physics?

Lift in aviation physics is defined as the force that opposes gravity. When an aircraft is in flight, lift is generated primarily by the wings as air flows over and under them. The shape of the wings, known as an airfoil, is designed to create a difference in air pressure above and below the wings, resulting in an upward force that counteracts the weight of the aircraft. This upward force enables the aircraft to ascend or maintain altitude.

Understanding that lift opposes gravity is crucial for pilots and engineers as they design aircraft to ensure that lift exceeds the weight of the aircraft during takeoff and flight. While other forces such as thrust (which propels the aircraft forward) and drag (the resistance force) are also important in the dynamics of flight, lift specifically refers to the vertical force that enables the aircraft to rise and stay aloft against the force of gravity.