Snooker: 'Kick' during a shot.
Those days when there were no 'kicks' on a snooker table, the boffins say the only difference is the thickness of the cloth.
If, when the white ball (WB) hits the object ball (OB), the white ball is moving towords the OB and the OB is stationary. So the cloth underneath the OB is stationary. The cloth underneath the WB is getting pushed by the WB. Somewhere before/after WB hits the OB there can be a little wrinkle due to the thinness of the cloth, which can make either ball react chaotically.
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