How is thrust defined in aviation?

In aviation, thrust is defined as the forward force produced by the engines to propel the aircraft. This force is essential for overcoming drag, which is the resistance an aircraft encounters as it moves through the air. Thrust allows an aircraft to accelerate during takeoff, maintain speed during flight, and climb to altitude. It is generated by different types of engines, including jet engines and propellers, which operate on the principle of Newton's third law of motion: for every action, there is an equal and opposite reaction. When engines expel air or exhaust gases backward, they create a forward thrust that moves the aircraft in the opposite direction.

Understanding the role of thrust in the context of flight dynamics is crucial for pilots and aviation professionals, as it directly impacts flight performance and maneuverability. Without sufficient thrust, an aircraft cannot maintain its required speed or altitude, which can be critical in various flight phases.