机械能守恒定律是历年高考的热点,用机械能守恒定律解题,由于只涉及物体的初末两个状态而不涉及具体的物理过程,这在一定程度上有效地简化了问题,成为解决力学问题的重要方法之一.机械能守恒与圆周运动的综合问题是一类广泛而典型的物理问题,对这类问题的分析解决应从两个角度 The law of conservation of mechanical energy is the hot spot of the college entrance examination over the years, solving the problem with the law of conservation of mechanical energy. Since only the initial and final states of the object are involved, no specific physical process is involved. This effectively simplifies the problem to a certain extent and becomes a mechanical problem One of the important methods is that the comprehensive problem of conservation of mechanical energy and circular motion is a kind of extensive and typical physical problem. The analysis and solution of such problems should be viewed from two aspects