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Sunday, 16 December 2012

Q.No. 6.9:- Explain how the swing is produced in a fast moving cricket ball?


Q.No. 6.9:- Explain how the swing is produced in a fast moving cricket

ball?
Ans:-  When a fast moving cricket ball moves in such a way that it spins as well as moves forward, then the air deflects due to the spin and unsmooth surface of ball the stream lines of air becomes closer to each other and results the increase of air speed and low pressure. On one side of ball there exists low pressure while on other side high. This change in pressure will cause the ball to lift. This will give an extra curvature to the ball known as swing, which deceives the batsman.

Extra Elucidation
Often Bernoulli's principle is used to explain the topspin effect, as the difference in speed between ball surface and air is greater on the top of the ball. For example, if the air flowing past the bottom of the ball is moving faster than the air flowing past the top then Bernoulli's principle implies that the pressure on the surfaces of the ball will be lower below than above. In other words, since there is more air friction occurring on the top surface of the ball compared to the bottom, this differential causes a greater pressure to be applied on the top of the ball, resulting in the ball being pushed down.
In ball sports, topspin is a property of a ball that rotates as if rolling in the same direction as it is moving. Topspin on a shot imparts a downward force that causes the ball to drop, due to its interaction with the air. It can be generated by hitting the ball with an up-and-forward swing, with the racquet facing below the direction it is moving. A topspin shot is the opposite of the slice; topspin itself is the opposite of backspin


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