理想绳是中学阶段常见的力学模型之一,理想绳上的力可以突变,理想绳可以使物体的速度发生突变,也可以使物体的动能发生突变,突变问题是绳类问题中的难点、易错点,掌握了突变规律,也就掌握了绳类问题.1弹力发生突变例1.如图1所示,将完全相同的两个小球A、B,用长L=0.8m的细绳悬于以速度v= The ideal rope is one of the common mechanical models in secondary school. The force of the ideal rope can be abrupt. The ideal rope can make the velocity of the object change suddenly, and it can also make the kinetic energy of the object change suddenly. The mutation problem is the difficulty in the rope problem. Wrong point, mastered the law of mutation, also mastered the rope class.1 elastic mutation 1 as shown in Figure 1, will be exactly the same two balls A, B, with long L = 0.8m rope Suspended at speed v =