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GATE Exam Questions - Engineering

Q1:

On an immersed body in a flowing fluid the lift force is :

A due to buoyant force

B always in the opposite direction to gravity

C due to Wake phenomenon

D the dynamic fluid-force component normal to approach velocity

ANS:B - always in the opposite direction to gravity

D is right.

Lift is the component of the total force in the direction perpendicular to the direction of motion. Lift is the force exerted by the fluid normal to the direction of motion.