Much like a wheel, this enables the seam to stay upright (or slanted) without wobbling.
This is conservation of angular momentum.
The awesome role of backspin in swing bowling and dipping yorkers: A thread.
If you've ever bowled any kind of seam in your life, you know that your fingers impart a backward spin on the ball as you release it.
Turns out, this is important in multiple ways.
Much like a wheel, this enables the seam to stay upright (or slanted) without wobbling.
This is conservation of angular momentum.
So your fingers naturally put backspin on the ball, which keeps the seam well-behaved, in a line, which is essential to even generate swing.
Remember when they talk about bowling fuller when it's swinging?
That's to give the ball more time in the air. More time = more swing = more lateral movement. Also, late swing.
Fine. But what does backspin do?
Why? Because of something called the Magnus effect.
The Magnus force is due to this backspin, and it lifts the ball.
The ball hits the ground later than it would if there were no backspin.
Interestingly, the Magnus effect also gives the famous dip (a la Ashwin) to spinners.
In that case, the ball has a forward spin, and the Magnus force acts downward.
This gives it a better chance of beating the bat.
This effect also generates drift (another Ashwin favourite).
But let's get back to backspin.
Turns out, for some ranges of backspin speed (about 1000 RPM) and ball speed (about 140 km/h), there is a *reverse* Magnus effect.
Yes, the famed Magnus force now acts *downward*, making the ball dip.
Dipping yorkers, anyone?
This can also be a lethal weapon that makes batsman misjudge length.
Imagine facing dip at 140 km/h!
High speed coupled with high backspin due to his whippy wrist mean some of Bumrah's balls end up in that freaky regime where the reverse Magnus force makes them *dip*!
No wonder Bumrah is one of the top bowlers today.
Instrumental in ensuring swing happens in the first place.
With the added consequence of increasing movement by lifting the ball!
And sometimes, getting it to dip as well!
https://t.co/7uRGdmbK1f
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— r a y a \U0001f319 (@lcvelylilith) February 20, 2020
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— \u2745\u1710\u170b\u1713\u170e (@uglyluhan) June 16, 2019
Two known examples of such elemental spirits that had god-like status are Raja Angin (king of the wind) and Mambang Tali Arus (spirit of river currents). There were undoubtedly many more which have been lost to time
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