What is the force exerted by the engine and its propeller(s) which pushes air backward to cause forward motion?

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Study for the Principles of Flight Test. Learn with flashcards and multiple-choice questions, each question includes hints and explanations. Prepare for your exam with confidence!

Multiple Choice

What is the force exerted by the engine and its propeller(s) which pushes air backward to cause forward motion?

Explanation:
Thrust is the forward force produced by the propulsion system as it pushes air backward. By Newton’s third law, pushing air toward the rear creates an equal and opposite forward push on the airplane. That forward push is what overcomes drag and moves the aircraft through the air. Lift, by contrast, acts upward to support weight; drag resists the forward motion; and weight pulls downward due to gravity. So the force described—pushing air backward to propel the aircraft forward—is thrust.

Thrust is the forward force produced by the propulsion system as it pushes air backward. By Newton’s third law, pushing air toward the rear creates an equal and opposite forward push on the airplane. That forward push is what overcomes drag and moves the aircraft through the air. Lift, by contrast, acts upward to support weight; drag resists the forward motion; and weight pulls downward due to gravity. So the force described—pushing air backward to propel the aircraft forward—is thrust.

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