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在圆周运动中,有关向心力的分析是其重点和难点,尤其是变速圆周运动的向心力,其变化是一动态过程,涉及到的知识较多,如有关静摩擦力的分析等,如果不能把握本质,经常会得出错误的结论．下面通过例题和大家一起探讨以下有关静摩擦力提供向心力的问题．例1 如图1所示,质量M=2kg的物体置于可绕竖直轴匀速转动的平台上,M用细绳通过光滑的定滑轮与质量为m=0．4 kg的物体相连,m悬于空中与M都处于静止状态,假定M
In the circular motion, the analysis of the centripetal force is its key and difficult point, especially the centripetal force of the variable speed circular motion. Its change is a dynamic process, and involves more knowledge, such as the analysis of static friction, if it cannot grasp the essence, Often draw the wrong conclusion. The following questions will be discussed together with everyone to discuss the following issues relating to the provision of centripetal force by static friction. Example 1 As shown in Figure 1, an object with mass M = 2 kg is placed on a platform that can rotate about a vertical axis at a constant speed. M is connected with a mass of m = 0.4 kg by a string through a smooth pulley, m Suspended in the air and M are at rest, assuming M