Engines are

Engines are

• A. Wheels
• B. Control Flaps
• C. Stabilize The Landing Gear
• D. Provide Thrust That Propels The Aircraft Forward

Answer: (D)

The main idea is how propulsion works. Engines generate thrust to push the airplane forward. This thrust comes from accelerating air backward, and by Newton’s third law the aircraft is pushed in the opposite direction, moving forward. That forward push gets the plane up to speed so the wings can create lift. The other items aren’t about propulsion: wheels support the aircraft on the ground and help it taxi, control flaps change lift and drag during takeoff and landing, and stabilizing landing gear keeps the aircraft steady on the ground and during landing. So engines’ job is to provide thrust that propels the aircraft forward.

The main idea is how propulsion works. Engines generate thrust to push the airplane forward. This thrust comes from accelerating air backward, and by Newton’s third law the aircraft is pushed in the opposite direction, moving forward. That forward push gets the plane up to speed so the wings can create lift. The other items aren’t about propulsion: wheels support the aircraft on the ground and help it taxi, control flaps change lift and drag during takeoff and landing, and stabilizing landing gear keeps the aircraft steady on the ground and during landing. So engines’ job is to provide thrust that propels the aircraft forward.