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一、摩擦力总是阻碍互相接触的两物体间将要发生或已发生的相对运动.而不能理解为阻碍物体运动. 如图,在水平传送带上的货物,随传
1. Friction always impedes the relative movement that will occur or has occurred between two objects in contact with each other. It cannot be understood as hindering the movement of objects. As shown in the figure, the goods on a horizontal conveyor belt