​​What is the physics behind a bowler rubbing the ball so many times before bowling it in the cricket match?

When the bowler is rubbing one side of the ball he is actually polishing or smoothening the surface of the ball. Another half of the ball remains as it is or rougher. When the baller throws the ball at high-velocity low pressure is created near a smooth surface and a high-pressure area is created on the rougher side. This pressure differential SWINGS ball in the air.


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