AerodynamicsQuestion 424 of 934

What is the sum of all opposing forces in steady flight?

  1. Equal to the lift
  2. Equal to the weight of the aircraft
  3. Equal to the thrust
  4. Zero
Show answer

Correct answer: Zero

In steady flight, the sum of the opposing forces is always zero. There are no unbalanced forces.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 5: Aerodynamics of Flight — Forces Acting on the Aircraft, page 99

Practice aerodynamics

Questions last reviewed: 18 October 2026