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一、选择题1.如图所示,两物体A、B叠放在水平面上,物体B被右端一个固定物体阻挡,现用水平力F拉物体A使之匀速运动,已知物体A、B之间和A与地面之间的动摩擦因
1. Multiple-choice questions 1. As shown in the figure, the two objects A and B are stacked on the horizontal plane. The object B is blocked by a fixed object at the right end. Now use the horizontal force F to pull the object A to make it move at a constant speed. Known objects A and B The dynamic friction between and between A and the ground