题:如附图(α)所示,支架A上置一横梁,一端放一物体,另一端站一人,横梁处于平衡状态。现在横梁的B处系一轻绳,横梁上的人(所站位置不变)用力拉绳,如附图(b)所示。问横梁是否会继续处于平衡状态? 解法一,只要分析人拉绳时横梁右边的力产生的对转轴A的力矩和人拉绳前是否相同。图(α)中,人对梁的压力产生一力矩,其大小为G人L人。图(b)中,人的受力情况如图(c)。 N=Tsinθ+G 梁右边的受力情况如图(d)所示,各力产生的力知之和为: Question: As shown in Figure (α), a beam is placed on the bracket A, one object is placed at one end, and the other end is standing at one end. The beam is in equilibrium. Now the beam at B is tied with a light rope, and the person on the beam (with the same station position) pulls the rope, as shown in (b). Ask whether the beam will continue to be in balance? Solution one, as long as the analysis of people pull the rope when the force on the right side of the beam generated by the torque on the axis A and people before the rope is the same. In Figure (α), a person exerts a moment on the beam’s pressure, and its size is G person L person. In Figure (b), the human condition is shown in Figure (c). N = Tsinθ + G The force on the right side of the beam is shown in Figure (d). The sum of forces generated by each force is: