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摩擦力有时做正功 ,有时做负功 ,有时不做功 .在具体解题中 ,如何把握摩擦力做功 ,对许多同学而言都是个棘手的问题 .下面作简单分析1 静摩擦力做功 :物体与接触面间如有静摩擦力 ,则它们各自受到对方对它们的摩擦力大小相等 ,方向相反 .若它们不运动 ,自然这一对静摩擦力就不
Friction sometimes does positive work, sometimes doing negative work, and sometimes does not work. In the specific problem solving, how to grasp the friction work is a thorny issue for many students. The following is a simple analysis of 1 static friction work: object and If there is stiction between the contact surfaces, each of them is subject to the same friction force of the other party and in the opposite direction. If they do not move, the natural static friction force is not