If there were no friction, an object in (motion) would never come to a rest.
如果没有摩擦力，那么一个在运动的物体永远也不会停下来。
By friction is meant a force opposing motion.
摩擦力指的是阻碍运动的一种力。
This force, which we call friction, always opposes motion.
这种总是阻碍运动的力我们称之为摩擦力。
This force, which we call friction, always opposes motion.
这种总是阻碍运动的力我们称之为摩擦力。
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