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The dynamic lift due to spinning is called 

The dynamic lift due to spinning is called  Correct Answer Magnus effect

CONCEPT:​

Magnus effect:

  • The force exerted on a rapidly spinning cylinder or sphere moving through air or another fluid in a direction at an angle to the axis of spin is called the Magnus effect.
  • This force is responsible for the swerving of balls when hit or thrown with spin.


Strokes law:

  • When a body falls through a fluid it drags the layer of the fluid in contact with it.
    • A relative motion between the different layers of the fluid is set and, as a result, the body experiences a retarding force. 
    • It is seen that the viscous force is proportional to the velocity of the object and is opposite to the direction of motion.
    • The other quantities on which the force F depends are viscosity η of the fluid and radius (a) of the sphere, the viscous drag force F:


⇒ F = 6 π η a v

  • Viscosity: Viscosity is the resistance offered by a fluid to its motion


EXPLANATION: 

  • Dynamic lift is the force that acts on a body, such as an airplane wing, a hydrofoil, or a spinning ball, by virtue of its motion through a fluid. 
  • The dynamic lift due to spinning is called the Magnus effect.  Hence option 3 is correct.

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