Meanwhile, no rust spots are on friction surface.

同时，联接面也不会出现锈点。

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Is mainly the axle axis and the bearing bush sliding friction surface wears, becomes rough, creates the bearing oil leak.

密炼机的主要是轴子轴与轴承衬的滑动摩擦表面磨损，变得粗糙，造成轴承漏油。

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To determine the anti-slip coefficient of the high-strength bolt which connects components of friction surface, it is screwed and determined by torsion and tensile testing machines respectively.

大六角头高强度螺栓连接副扭矩系数的检测，扭剪型高强度螺栓连接副坚固预拉力的检测，高强度螺栓连接磨擦面抗滑移系数的检测，是钢结构材料验收中的重要测量。

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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

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

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