What does Bernoulli's Principle state in relation to flight?

Bernoulli's Principle posits that an increase in the speed of a fluid is accompanied by a decrease in pressure. This principle is fundamental to understanding how aircraft wings generate lift. When air flows over a wing, the shape of the wing (airfoil) causes the air to travel faster over the top surface compared to the bottom. According to Bernoulli’s Principle, the faster-moving air above the wing results in lower pressure compared to the higher pressure below the wing, which is at a slower speed. This difference in pressure generates lift, allowing the aircraft to rise into the air.

The other choices do not accurately reflect Bernoulli's Principle or its implications for flight. For instance, the first option incorrectly states the relationship between speed and pressure. Increased viscosity affecting lift is not a factor directly explained by Bernoulli's Principle, and while the angle of attack does affect lift, it does not directly correlate with fluid speed as described by Bernoulli's Principle. Understanding this principle is crucial for pilots and those studying aerodynamics, as it provides a foundation for the mechanics of lift and how aircraft operate in flight.