静摩擦力产生于保持相对静止但具有相对运动趋势的两物体的接触面间，其作用是阻碍物体要发生的相对运动．静摩擦力的方向可能与物体的运动方向相同、相反、垂直或成任意角度．静摩擦力的大小可为零至最大值间的任何值，其大小由物体的运动情况和受力情况决定，除最大值ｆｍ＝ Static friction is generated between the contact surfaces of two objects that are relatively stationary but have a relative tendency to move, and their role is to hinder the relative movement of the objects to occur. The direction of static friction may be the same, opposite, vertical or at any angle to the direction of motion of the object. The size of the static friction force can be any value between zero and maximum. The size of the static friction force is determined by the motion and force conditions of the object, except the maximum value fm=