摩擦力做功的几个重要结论甘肃省白银市实验中学何万龄大家知道，静摩擦力和滑动摩擦力，既可以是阻力，也可以是动力．因此，静摩擦力和滑动摩擦力的功，既可以是动力功（做正功），也可以是阻力功（做负功）．又由于物体间的相互作用力总是成对出现，大小相等，方向相反... Several important conclusions about the work of friction work He Wanling, Baiyin Experimental Middle School, Gansu Province Everyone knows that static friction and sliding friction can be both resistance and power. Therefore, the work of static friction and sliding friction can be either power work (doing positive work) or resistance work (doing negative work). And because the interaction forces between objects always appear in pairs, equal in size and opposite in direction...