Private Pilot License (PPL) Aerodynamics Practice Exam

What is the relationship between angle of attack and lift?

1. Lift decreases with angle of attack

2. Lift is independent of angle of attack

3. Lift increases with angle of attack up to a critical point

4. Lift remains constant at all angles of attack

The correct answer is: Lift increases with angle of attack up to a critical point

The relationship between angle of attack and lift is significant and fundamental in aerodynamics. As the angle of attack increases, lift generally increases as well, up to a certain critical angle. This critical point represents the maximum angle of attack that an airfoil can achieve before stalling occurs. At low angles of attack, airflow over the wing remains smooth, allowing for efficient lift generation. As the angle increases, the airflow begins to separate from the wing's surface, increasing lift up to a point. Once this critical angle is surpassed, airflow separation becomes pronounced, causing a substantial decrease in lift due to stall conditions. This understanding is essential for pilots, as managing the angle of attack is crucial during different phases of flight to maintain control and ensure safe operation of the aircraft. Hence, recognizing that lift increases with angle of attack, up to a point, is vital for flight maneuverability and safety.