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How lift is calculated?

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How lift is calculated?

(a) Perpendicular to the direction of motion

(b) Parallel to the direction of motion

(c) opposite to the direction of motion

(d) relative to the direction of motion

The question was asked in semester exam.

This is a very interesting question from The Symmetric Airfoil in division Incompressible Flow over Airfoils of Aerodynamics

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Correct answer is (a) Perpendicular to the direction of motion

The explanation is: An airfoil shaped body moved through a fluid produces an aerodynamic force. The component of this force perpendicular to the direction of motion is called lift. The lift will oppose the motion and it produces the lift.

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