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笔者在教学过程中碰到一个物理结论,学生对其很难理解,而大多教师则往往仅限于讲清这个结论,却忽视了一个关键问题。推论:自由释放的滑块在斜面上匀速下滑时,斜面对水平面的摩擦力为零,这一过程中再在滑块上施加一个竖直平面内任何方向的作用力(如图一),在滑块停止向下滑动之前斜面对水平面的静摩擦力依然为零。
The author encountered a physical conclusion in the process of teaching, which is hard for students to understand. However, most teachers tend to confine this conclusion to a neglect of a key issue. Corollary: When the free-released slider slides down at a constant speed, the friction of the inclined plane to the horizontal plane is zero. During this process, a force in any direction within the vertical plane is applied to the slider (as shown in Figure 1) Before the slider to stop sliding down before the static friction on the horizontal plane is still zero.