What force counteracts drag during flight?

Thrust is the force that counteracts drag during flight. In the context of flight dynamics, thrust is generated by the aircraft's engines and is essential for propelling the aircraft forward. Drag, which is the aerodynamic resistance encountered by the aircraft as it moves through the air, works against this forward motion.

When an aircraft is flying, the engines produce thrust, which must be sufficient to overcome drag in order for the aircraft to maintain forward speed and altitude. If thrust exceeds drag, the aircraft accelerates; if thrust is less than drag, the aircraft decelerates. This relationship is crucial for achieving and maintaining stable flight.

Understanding this interplay between thrust and drag is fundamental in aerodynamics, as it informs pilots and engineers about the performance and efficiency of the aircraft in various flight conditions.