两个相互接触的粗糙物体,在外力作用下有相对运动趋势时,将产生反抗相对运动的静摩擦力作用。当外力增大超过某一临界值时,物体间要发生相对滑动,变静摩擦力为滑动摩擦力。然而,在一些条件下,即使驱动外力无限增大,物体间也不会发生相对滑动,这种现象即为自锁 Two rough objects in contact with each other, under the action of external forces have a relative movement trend, will have to resist the relative movement of the static friction effect. When the external force increases beyond a certain critical value, the relative sliding occurs between the objects, and the variable static friction force is the sliding friction force. However, under some conditions, even if the driving external force increases indefinitely, there will be no relative sliding between the objects, and this phenomenon is self-locking