1. Bernoulli's Principle: This principle states that as the speed of a fluid (like air) increases, its pressure decreases. In an airfoil (the shape of a wing), the curved upper surface forces air to travel a longer distance than the flatter lower surface. This results in faster airflow over the top, lower pressure on the top, and therefore a net upward force (lift).
2. Newton's Third Law of Motion: This law states that for every action, there is an equal and opposite reaction. As the wings push air downwards (action), the air pushes back upwards on the wings (reaction). This downward push of air is called "downwash", and it contributes to the overall lift generated.
While both these principles play a role in lift generation, Bernoulli's principle is considered the primary contributor. It is the difference in pressure created by the airfoil's shape that accounts for the majority of lift. Newton's third law contributes by adding to the upward force generated by the airfoil's interaction with the air.
