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一选择题.1、在倾角为α的光滑固定斜面上有A球,如图所示,用绳通过定滑轮与B球连接,并被一竖直的木板M挡住,处于静止状态。不计一切摩擦,分析A球的受力个数可能为2A..如2图个所示B,.3个C.4个D.5个轻绳的一端系在质量为m的物体上,另一端系在一个圆环上,圆环套在粗糙水平横杆MN上
A multiple-choice question 1. There is an A ball on a smooth fixed slope with an inclination of α. As shown in the figure, the rope is connected to the B ball through a fixed pulley, and is blocked by a vertical board M and is in a stationary state. Excluding all frictions, analyzing the force of a ball may be 2A. As shown in Figure 2, B, .3 C.4 D. 5 ends of a light rope are tied to an object of mass m. One end is attached to a ring and the ring is set on a rough horizontal bar MN