The four forces acting on an airplane in flight are
A
lift, weight, thrust, and drag.✓ Correct Answer
B
lift, weight, gravity, and thrust.
C
lift, gravity, power, and friction.
Explanation
PHAK Chapter 5 names the four forces acting on an airplane in flight: lift, weight, thrust and drag. Gravity is what produces weight, so listing both double-counts it, and power and friction are not among the four forces.
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