The four forces acting on a helicopter in flight are
A
lift, drag, thrust, and weight.✓ Correct Answer
B
lift, weight, gravity, and thrust.
C
lift, gravity, power, and friction.
Explanation
As with airplanes, the four forces acting on a helicopter in flight are lift, weight, thrust and drag. Gravity produces weight, so listing both double-counts it, and power and friction are not among the four forces.
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