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从“滑动摩擦力对系统做的功”中可得一重要结论:滑动摩擦力对系统做负功,滑动摩擦力在相对位移上做的功等于系统机械能的损失。等价的说法:两个物体相互摩擦而产生的热量 Q(或者说系统内能的增加量)等于物体之间滑动摩擦力与这两个物体相对滑动的距离的乘积。关于滑动摩擦力对系统做功的特点我们可以进一步拓展,推广到更一般的情形,可以得到一个非常简洁而实用的导出公式。我们知道能量的转化和守恒定律是一个普遍的规律,对一些在水平方向只受滑动摩擦力或恒定斥力相互作用的两个物体,其能量关系可简化为一个公式 Q=fL=ΔE(f 为滑动摩擦力或恒定斥力,L 为两物体间的相对位移,ΔE 为系统机械能的损失)。公式的含义为‘两个物体相互摩擦而产生的热量’或‘滑动摩擦力或恒定斥力对系统做的
An important conclusion can be drawn from the “sliding friction force to the system”: sliding friction does negative work on the system, and the sliding friction force on the relative displacement is equal to the loss of system mechanical energy. Equivalent statement: The heat Q (or the increase in the internal energy of the system) caused by friction between two objects is equal to the product of the sliding friction between the two objects and the relative sliding distance between the two objects. With regard to the characteristics of the sliding friction force on the system, we can further expand and generalize to a more general situation. We can get a very simple and practical export formula. We know that the law of energy conversion and conservation is a universal law. For two objects that interact in the horizontal direction only by sliding friction or constant repulsion, the energy relationship can be reduced to a formula Q = fL = ΔE (f is Sliding friction or constant repulsion, L is the relative displacement between the two bodies, and ΔE is the loss of the mechanical energy of the system). The meaning of the formula is ‘the heat generated when two objects rub against each other’ or ‘sliding friction or constant repulsion