Private Pilot License (PPL) Aerodynamics Practice Exam 2025 – Your Complete Guide to Mastering Flight Dynamics

Bernoulli's principle describes the behavior of fluid flow and explains the relationship between the speed of a fluid and its pressure. According to this principle, as the speed of the airflow increases, the pressure within that flow decreases. This is a fundamental concept in aerodynamics and is closely related to how lift is generated over an airfoil.

When airflow accelerates over the top surface of an airfoil, for instance, it results in lower pressure in that region compared to the higher pressure below the airfoil. This pressure differential is what contributes to lift, allowing an aircraft to rise off the ground. Therefore, an increase in airspeed corresponds with a decrease in pressure, aligning with the correct answer.

Understanding this relationship is crucial for pilots, as it helps in grasping how various flight maneuvers can affect aircraft performance and stability.