Final answer:
Newton's third law of motion explains how an aircraft is lifted against the force of gravity.
Step-by-step explanation:
Newton's third law of motion helps explain how an aircraft is lifted against the force of gravity. According to this law, for every action, there is an equal and opposite reaction. When an aircraft's wings push air downwards and backwards to create lift, the air exerts an equal and opposite force on the wings, pushing the aircraft upwards.
Learn more about Newton's laws of motion