037与摩擦力做功及摩擦热相关的6种题型 精讲精练-2022届高三物理一轮复习疑难突破微专题
037与摩擦力做功及摩擦热相关的6种题型一.必备知识精讲1.摩擦力做功正负情况运动的物体受到滑动摩擦力或静摩擦力时,若摩擦力的方向与运动方向相反,则摩擦力做负功,该摩擦力就是阻力;若摩擦力的方向与运动方向相同,则摩擦力做正功,该摩擦力就是动力。总之,摩擦力既可能做负功,也可能做正功,还可能不做功。举例如下:1/13037与摩擦力做功及摩擦热相关的6种题型2.两种摩擦力做功与能量转化的情况比较 类别比较 静摩擦力滑动摩擦力不同点能量的转化方面在静摩擦力做功的过程中,只有机械能从一个物体转移到另一个物体(静摩擦力起着传递机械能的作用),而没有机械能转化为其他形式的能量(1)相对运动的物体通过滑...
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