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弹力和静摩擦力都是接触力.关于弹力和静摩擦力受力情况分析的不少问题,必须根据物体的运动状态,结合运动定律或平衡条件方能奏效.我认为解决问题的关键是明确物体处于临界状态下的临界条件,因为临界条件是这类问题的转折点. [例 1]如图1所示,两滑块A、B叠在一起,置于倾角为θ的固定外面上,滑块A、B的质量分别为M、m,A与斜面之间的滑动摩擦系数为μ_1,已知两滑块以相同加速度从斜面滑下,在下滑过程中,试定性确定滑块B
Both elastic and static friction forces are contact forces. Many questions about the analysis of the force conditions of elastic and static friction forces must be based on the motion state of the object, combined with the laws of motion or equilibrium conditions. This is the key to solving problems. The critical condition in the critical state, because the critical condition is the turning point of this kind of problem. [Example 1] As shown in Fig. 1, the two sliders A, B are stacked and placed on a fixed outer surface with a tilt angle θ, the slider A The masses of B and B are M and m, respectively. The sliding friction coefficient between A and the slant is μ_1. It is known that the two sliders slide down from the slant surface with the same acceleration. During the slide-down process, the slider B is qualitatively determined.