What is drag in terms of aerodynamics?

In aerodynamics, drag refers to the resistance that an aircraft encounters as it moves through the air. This resistance acts in a direction opposite to the aircraft's motion and can significantly impact its performance and fuel efficiency. Understanding drag is crucial for aircraft design and operation, as it affects speed, maneuverability, and overall flight dynamics.

Thrust, weight, and lift, while essential concepts in aerodynamics, do not define drag. Thrust is the force that propels the aircraft forward; weight is the force due to gravity acting on the aircraft; and lift is the upward force generated by the wings that allows the aircraft to rise into the air. Thus, recognizing drag as the resistance an aircraft encounters is key to comprehending its role in flight and aerodynamics.