Which principle explains how a plane generates lift?

• A. Newton's Third Law
• B. Bernoulli’s principle
• C. Archimedes' principle
• D. Gravity

Answer: (B)

The principle that explains how a plane generates lift is Bernoulli’s principle. This principle states that as the speed of a fluid increases, the pressure within that fluid decreases. When applied to an airplane wing, the air traveling over the top surface of the wing moves faster than the air traveling underneath it. This difference in speed creates lower pressure on the top surface of the wing compared to the higher pressure beneath the wing.

As a result, the pressure difference between the upper and lower surfaces generates lift, allowing the airplane to rise into the air. Factors such as wing shape (airfoil design) and angle of attack influence how effectively Bernoulli’s principle can be applied to create lift.

While Newton's Third Law relates to action and reaction forces, it does not directly explain the mechanism of lift generation in the context of airflow around wings as Bernoulli’s principle does. Archimedes' principle pertains to buoyancy in fluids, which is not directly applicable to lift generation in an air environment. Gravity, while essential for understanding the forces acting on an aircraft, does not provide the mechanism that explains how lift is generated; it primarily acts as the opposing force to lift.