The force which must be overcome to keep one surface moving over another in known as sliding friction.

而保证一个平面沿着另一个平面相对移动的力称为滑动摩擦力。

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The force which must be overcome to keep one surface moving over another in known as sliding friction.

而保证一个平面沿着另一个平面相对移动的力称为滑动摩擦力。

youdao