一、滑动摩擦力的方向相互接触的粗糙物体间有挤压和相对运动时,就会存在滑动摩擦力.由滑动摩擦力产生的条件可知,滑动摩擦力的方向总是与物体“相对运动”的方向相反,所谓相对运动的方向,即是把与研究对象接触的物体作为参照物,该研究对象运动的方向.有些同学忽视对“相对运动”概念的理解,从而错认为滑动摩擦力的方向与 First, the direction of the sliding friction between the contact between the rough objects with a squeeze and relative movement, there will be sliding friction. From the conditions generated by the sliding friction, we can see that the direction of sliding friction is always with the object “relative motion” In the opposite direction, the so-called relative movement direction refers to the object that is in contact with the research object as a reference object and the direction of movement of the research object. Some students neglect the understanding of the concept of “relative motion” and thus mistakenly consider the direction of sliding friction. versus