Class 11PhysicsMechanical Properties of FluidsBernoulli's Theorem and Applications of Bernoulli's Theory
EasyWhy does a flag (or ensign) flutter when there is strong wind? Explain.
(N/A) When there is strong wind,the air flows rapidly over the surface of the flag. According to Bernoulli's principle,for a horizontal flow of fluid,an increase in the speed of the fluid occurs simultaneously with a decrease in pressure.
Since the wind speed is high at the free end of the flag,the pressure there becomes low.
However,the pressure near the support (pole) remains relatively higher.
This pressure difference creates a force that causes the flag to oscillate or flutter.
Since the wind speed is high at the free end of the flag,the pressure there becomes low.
However,the pressure near the support (pole) remains relatively higher.
This pressure difference creates a force that causes the flag to oscillate or flutter.
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