What are the four aerodynamic forces that act on an aircraft in flight?
Why →
The four forces are Thrust (forward force from propulsion), Drag (rearward air resistance), Lift (upward force perpendicular to relative wind), and Weight (downward gravitational force). In straight-and-level unaccelerated flight, thrust equals drag and lift equals weight.The trap →
"Power" is not one of the four forces. Power produces thrust. "Velocity" and "mass" are properties, not forces. These four specific forces appear in multiple forms across Part 107 test questions.SOURCE → PHAK Chapter 5, Aerodynamics of FlightCHECKED APR 21ACS IV.A.K1MED