The thickness of the wake, and the drag on the ball, depends upon the terms in the border which, as we have seen, depends on the Reynolds number. The stitches on the ball create surface roughness that disrupts the border layer, inducing the boundary layer to transition in a lower value of the Reynolds number than to get a smooth ball. Remember, a ball is, in consequence, a type of balloon – the more air there is inside, the lighter it is and, like “roundness,” this decreases marginally the touch surface area. ‘s surface. At higher stresses, the area of contact is bigger (since the ball is more “rounder”) and thus there is less friction over the passage of the ball throughout the pitch face. There is a smaller, secondary effect at greater pressure caused by a marginally increased “elevator ” that makes the ball ride a little higher over the pitch . Next into the surface of the item, the molecules of the atmosphere stick into the outside, as discussed at the properties of atmosphere slide.

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