论文部分内容阅读
临界问题是高考考查的热点,特别是圆周运动中的临界问题,知识覆盖面广,题型多样,是我们必须重点掌握的知识,对此我进行了探索,归纳了以下几种类型的问题。一、水平面内的临界问题例1如图1所示,两根轻绳同系一个质量m=0.1kg的小球,两绳的另一端分别固定在轴上的A、B处,上面绳AC长L=2m,当两绳都拉直时,与轴的夹角分别为30°和45°,求当小球随轴一起在水平面内做角速度为ω=4rad/s的匀速圆周运动时,上下两轻
The critical problem is the hot spot for college entrance examination examination, especially the critical problem in circular movement. The knowledge is widely covered and the variety of questions is the knowledge we must master. I have explored this and summarized the following types of problems. First, the critical problem in the horizontal plane Example 1 As shown in Figure 1, the two light rope with the same mass m = 0.1kg ball, the other end of the two ropes were fixed on the shaft A, B Department, above the rope AC long L = 2m, when the two strands are straightened, the angle between the two axes is 30 ° and 45 °, respectively. When the ball is uniformly moving along the axis in the horizontal plane with an angular velocity of ω = 4 rad / s, Two light