论文部分内容阅读
学习摩擦力这一节后,大部分同学感觉较难,难在何处呢?其实主要是物体间运动的相对性未搞清楚.尽管大家都知道摩擦力的方向总是沿着物体的接触面与物体间的相对运动或相对运动趋势方向相反,遇到物体在一维方向上的相对运动判断还比较清楚,但若遇到较为复杂的二维方向上的问题,物体间的相
After learning the friction, most students feel more difficult and difficult to find. The main reason is that the relative motion of objects is not clear. Although we all know that the direction of friction is always along the contact surface of the object. The relative motion or relative motion between the objects is in the opposite direction, and the relative motion of the objects in the one-dimensional direction is still relatively clear, but if there is a problem in the more complicated two-dimensional direction, the phases between the objects