若一个物体参与了多个运动过程,有的过程只涉及运动和力的问题或只要求分析物体的动力学特点,则要用动力学方法求解;若某过程涉及到做功和能量转化问题,则要考虑应用动能定理或机械能守恒定律求解.这些问题往往是学生最容易出错的.下面举例进行探究.例1如图1所示,一粗糙斜面AB与圆心角为37°的光滑圆弧BC相切,经过C点的切线方向水平.已知圆弧的半径为R=1.25 m,斜面AB的长度为L= If an object participates in a number of motion processes, some of which involve only motion and force problems, or require only analysis of the dynamics of an object, kinematic methods are used to solve the problem. If a process involves work and energy conversion, To consider the application of kinetic energy law or the law of conservation of mechanical energy. These problems are often the most likely to make mistakes students .Examples to explore .Example 1 As shown in Figure 1, a rough bevel AB and the central angle of 37 ° smooth arc BC phase Cut through the tangential direction at point C. It is known that the radius of the arc is R = 1.25 m and the length of the bevel AB is L =