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Science behind rotating ball

Magnus effect

how a cricket spinner spin the ball??

Players of TENNIS and CRICKET often feels that, when a ball is thrown then it does not follow a straight line but it follows a curved path, WHY??? 
                      
                             i'll explain it,why a cricket ball follows a curved path.





when a ball is thrown then an effect works behind it called MAGNUS  EFFECT

i'll explain it by a figure so that i can make it easier


   The movement of ball on curved path is called SWING. 
  • When a, thrown ball moves ahead,then empty space  left behind  the ball is  filled by the air rapidly.
  • Let the air velocity is "v" (air going to fill the empty)
  • If the ball is spining with velocity "u" then the air around the ball is also moving with velocity "u"
  • Then as shown in the figure, the velocity of lower side of the ball is "u+v" and of upper side is "u-v" 
  • It results that, pressure on upper side of the ball is greater than the lower side(BERNOULLI'S THEOREM)
  • Due to this pressure difference the ball moves in a curved path.
  • This is called   MAGNUS EFFECT.
  • Bowllers use this trick behind swing the ball, spin the ball.
  • famous bowler Zaheer Khan,Murlitharan,Shane warn are known for there bowlling all over the world.
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