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一、比条件,注意摩擦力为零与产生条件的关系在两个相互接触的物体间产生摩擦力必须具备三个条件:(1)两个物体相互接触,相互间存在压力;(2)两个物体的接触面不光滑;(3)两个物体间存在着相对运动或相对运动的趋势.这三个条件同时满足才有摩擦力产生,但当摩擦力为零时,则不满足的条件有多种情况.例1关于摩擦力下列说法是正确的是()(A)两物体间没有相对运动,也可能有摩擦力(B)两物体间接触面粗糙,有相对运动,一定有摩擦力
First, the conditions, pay attention to zero friction and the relationship between the conditions of friction between the two objects in contact with each other must have three conditions: (1) the two objects in contact with each other, there is pressure on each other; (2) two The contact surface of the object is not smooth; (3) there is a relative movement between two objects or the relative movement of the trend of these three conditions to meet the friction generated, but when the friction is zero, the unsatisfied conditions There are many cases. Example 1 About Friction The following is correct () (A) There is no relative motion between two objects, there may be friction (B) The contact surface between the two rough, there must be relative movement, there must be friction force