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how to Wrist-spin works in cricket

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trick for bowling how to Wrist-spin works in cricket

So to explain exactly how the effect comes about, lets take a look at a spinning golf ball in a wind tunnel:

(I took the top image from this website – the annotations in the picture under that are my own)

Actually what you see here is a spinning golf ball in a water tunnel, with a dye squirted onto the front face of the ball to show the flow of the water around it. The water isn’t moving very fast, but because water is much more viscous and less compressible it is analogous to what happens in air.

Looking at the two arrows indicating the spin of the ball, the top edge of the ball is travelling backwards, and the bottom edge is moving forwards. The effect of this is that the top edge behaves like a ball that is moving through the air slower than the spinning ball actually is, while the bottom edge acts as if it is travelling faster. When a ball travels through the air at speed, it creates a wake. If it travels through the air slower the air is more able to get around the ball, making the wake smaller. And if it travels quicker the wake gets bigger, until at some point the flow becomes turbulent.

So therefore, and as the picture shows, the side of the ball travelling slowly through the fluid creates a small, smooth wake while the faster side creates a larger, turbulent wake. This lopsided wake means the air is propelled downwards, and because momentum is conserved this results in an upwards force on the ball. This force is what creates the Magnus effect.

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