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题目如图1所示,半径为R、质量不计的圆盘盘面与地面相垂直,盘面圆心处有一个与盘面垂直的光滑水平固定的轴O,在盘的右边缘固定一个质量为m的小球A,在O点正下方
The problem is shown in Figure 1. The surface of the disc with radius R and mass is perpendicular to the ground. There is a smooth horizontal fixed axis O perpendicular to the disc surface at the center of the disc, and a small mass m is fixed at the right edge of the disc. Ball A, just below O