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摩擦力分滑动摩擦力和静摩擦力.解题时首先要弄清是哪一种摩擦力,它有何特点.滑动摩擦力是一个物体在另一个物体表面滑动时所产生的摩擦力.这时相互接触的两个物体之间产生了相对运动,而摩擦力表现为阻碍相对运动,故滑动摩擦力的方向与物体相对运动的方向相反.滑动摩擦力的大小与接触面的粗糙程度及两接触面之间的正压力大小有关.
The frictional force is divided into sliding friction force and static friction force. When solving a problem, it is first necessary to find out which type of frictional force it has. The sliding frictional force is the frictional force generated when an object slides on the surface of another object. Relative motion occurs between two objects that are in contact with each other, and friction acts as a hindrance to relative motion. Therefore, the direction of the sliding friction is opposite to the direction of relative movement of the object. The size of the sliding friction and the roughness of the contact surface and two contacts The pressure between the faces is related to the size of the positive pressure.