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When a spinning ball hits a low friction surface such as grass, it will continue to spin.
BBC: SPORT | Tennis | Rules and Equipment | On the rebound
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But on a high friction surface like clay, the ball will grip more and change the trajectory of the ball quite significantly.
BBC: SPORT | Tennis | Rules and Equipment | On the rebound
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What's more, a machine-made surface produces the wrong kind of friction: to do its job precisely, the plate's surface needs minute scorings, of only a few microns each, where machine oil can reside.
CNN: ASIANOW - TIME Asia | GizmoLand! | Man Beats Machine
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The CPR numbers give a hint as to whether a ball will bounce higher or lower on a specific surface, and how much friction there is to either slow the ball or allow it to skid on.
CNN: Tennis interactive: Why clay is so different
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When the drilling is finished, water, combined with chemicals designed to reduce friction and serve other purposes, is injected from the surface into the well shaft at very high pressures, thereby fracturing the shale rock formations far below, and making it possible to extract economically the natural gas embedded in the shale.
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The crushed-brick mixture that constitutes the base of a clay court produces a the highest bounce and most friction of the three surfaces, meaning they have the lowest CPR of all three surface types and are considered as the "slowest".
CNN: Tennis interactive: Why clay is so different
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Featuring grooved serrations on its surface, the X Headphones' detachable cord provides an innovative design that eliminates friction between cable surfaces, reducing the incidence of frustrating tangles.
ENGADGET: Sony and Simon Cowell intro X Factor-themed MDR-X10, celebrity headphones officially jump the shark for $300
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Featuring grooved serrations on the surface, the cords on Sony Extra Bass headphones provide an innovative design that eliminates friction between cable surfaces and reduces the source of frustrating tangles.
ENGADGET: Sony ships new Extra Bass headphone lineup to the US, delivers that Direct Vibe to your brain