由于参与作用的物体较多,因此,我们在分析多物体系统作用的情况时,要巧选研究对象,从中找到解题的突破口。例1.如图1所示,一个质量为m的物块沿斜面体以加速度a下滑,斜面体的质量为M、倾角为θ。物块与斜面体、斜面体与地面间均很粗糙,在物块下滑过程中,斜面体始终静止在水平地面上。求地面对斜面体的支持力和摩擦力。 Due to the large number of objects that participate in the action, when we analyze the role of multi-object systems, we should select those who are the subjects of study and find a breakthrough point for solving the problem. Example 1. As shown in Fig. 1, a mass of mass m slides down the ramp at an acceleration of a, with the mass of the ramp being M and the angle of inclination being θ. Blocks and bevel body, between the bevel body and the ground are very rough, in the process of falling objects, the bevel body is always stationary in the horizontal ground. Seek the ground support and friction of the slope body.