Which force counteracts gravity in flight?

Which force counteracts gravity in flight?

• A. Lift
• B. Weight
• C. Thrust
• D. Drag

Answer: (A)

Lift is the upward aerodynamic force produced by the wings or rotor blades as air moves past them. This force counters gravity by pushing up against the weight that pulls the UAV downward. The amount of lift depends on airspeed, wing or rotor area, air density, and the angle of attack. In steady, level flight, lift equals weight, keeping the aircraft's altitude constant. If lift becomes greater than weight, the UAV climbs; if lift is less than weight, it descends. The other forces—weight (downward gravity), thrust (forward propulsion), and drag (air resistance)—play different roles in flight but do not counter gravity directly.

Lift is the upward aerodynamic force produced by the wings or rotor blades as air moves past them. This force counters gravity by pushing up against the weight that pulls the UAV downward. The amount of lift depends on airspeed, wing or rotor area, air density, and the angle of attack. In steady, level flight, lift equals weight, keeping the aircraft's altitude constant. If lift becomes greater than weight, the UAV climbs; if lift is less than weight, it descends. The other forces—weight (downward gravity), thrust (forward propulsion), and drag (air resistance)—play different roles in flight but do not counter gravity directly.