Friday, August 26, 2011

Does the "Cloud cover" really help the Cricket ball to swing? (Biggest Cricket myth)


  • You don't want to be a Cricket fan to read this post. This is about the biggest Cricket myth ever. I'll explain what "Swing" is for non-Cricket fans. Faster bowlers usually balls at speeds of 120kmh -150 kmh. While they bowl they change the path of the ball, so the ball will not come in the same track. Some bowlers swing the ball in both the directions making it really difficult to the batsmen.
See how the ball changed it's track due to swing. ( graphics shows a few balls, not just one)

  • Most of the Fast bowlers swing far too much in overcast cloudy conditions and this has been the real mystery of Cricket. So many scientists tried to put forward an acceptable theory to explain this but all of them failed. But one of the NASA scientists was able to clear out all the myths.


  • Before listening to him let's see how the ball actually swings. We use "Bernoulli  theory" to explain this incident. 



  • Bowling team make sure that only one surface gets rough while the other remains smoother. That selected smooth surface is always being rubbed on a player's trouser to make it even smoother. The speed of air on that smoother surface is higher than the speed of air on rough surface. As a result the pressure on rough surface becomes higher than the pressure on smooth surface. Then the ball starts to swing/ move to the direction of smooth surface.


  • As I mentioned early Scientists failed to explain the relationship between swing and "Cloud cover". But the NASA scientist Rabindra Mehta, completely denied any assistant of cloud cover in swinging. Yet another "Myth". 


  • Then why the English bowlers do well in Overcast conditions? Haven't they done well against Indian batters recently even without overcast conditions?. They did the same with the help of the clouds against Sri Lanka. So the conditions don't matter. It's just "Bernoulli". 

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