Final answer:
The four fundamental forces of flight are lift, thrust, drag, and weight.
Step-by-step explanation:
The four fundamental forces of flight are: lift, thrust, drag, and weight. These forces play a crucial role in the ability of an object, such as an airplane, to stay in the air and control its motion.
Lift is the upward force generated by an aircraft's wings, which allows it to overcome gravity and stay in the air. Thrust is the forward force that propels the aircraft through the air. Drag is the resistance encountered by the aircraft as it moves through the air, and it acts in the opposite direction of the motion. Finally, weight is the force exerted by the Earth on the aircraft, which acts downward.