Weight is defined as:

Weight is defined as the force exerted by gravity on an object. In the context of an aircraft, weight acts downward due to the gravitational pull of the Earth. This downward force is crucial to aviation as it directly affects various aspects of flight, including takeoff, flight stability, and landing. Understanding weight is essential for flight attendants and crew members, as it influences the aircraft's overall performance and operational safety.

The other choices represent different types of forces related to flight dynamics. The concept of an upward force lifting the aircraft corresponds to lift, which is generated by airfoil shapes and is essential for maintaining altitude during flight. The force propelling the aircraft forward refers to thrust, which is produced by the engines. Lastly, the force that resists motion describes drag, which opposes the aircraft's thrust during flight. Recognizing these distinctions helps reinforce the understanding of weight as a specific force in the aviation context.