Final answer:
The distribution of lift is vital for aircraft performance, affected by the wing shape and angle of attack, according to Bernoulli's principle. Helicopters generate lift through the reaction to downwash created by their main rotors. The interaction of air with the wing is considered an external force essential for lifting aircraft.
Step-by-step explanation:
The distribution of lift acting on an aircraft is crucial as it affects several aspects of the aircraft's performance and stability. Lift is generated by the airflow around the wing, which is influenced by the shape of the wing and the angle of attack. According to Bernoulli's principle, the air moving faster over the upper surface of a wing results in lower pressure, therefore creating lift. Additionally, airplanes can turn by banking, where the lift force is tilted to provide a horizontal component that accelerates the plane in a turn. Helicopters generate lift by rotating their main lift blades to push air down, and the body of the helicopter is kept from rotating by a small rotor on the tail that provides thrust. This is an application of Newton's third law, where the reaction force to the downward push of air results in lift for the helicopter. Moreover, the force of air on the helicopter is considered an external force because it comes from outside the helicopter's system. To sum up, the distribution of lift is essential for the control and maneuverability of the aircraft, with additional contributions to lift coming from the aircraft's body, engine thrust, and other factors. Accurate understanding and management of lift enable effective piloting and efficient aircraft performance.