The Magnus effect or Magnus force is the phenomenon whereby a spinning object flying in a fluid creates a whirlpool of fluid around itself, and experiences a force perpendicular to the line of motion. The overall behaviour is similar to that around an airfoil (see lift force) with a circulation which is generated by the mechanical rotation, rather than by aerofoil action. The Magnus effect is often considered a demonstration of Bernoulli's principle, but this is incorrect, as the viscosity of the air — assumed to be negligible in Bernoulli's principle — is central to understanding the magnitude of the force.
In many ball sports, the Magnus effect is responsible for the curved motion of a spinning ball. The effect also affects spinning missiles, and is used in rotor ships and Flettner aeroplanes.
Read more about Magnus Effect: Principle, History, Calculation of Magnus Force, In Sport, In External Ballistics, In Flying Machines, In Astronomy, 2010 FIFA World Cup Match Ball
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