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两个相互接触的物体,当它们要发生或已经发生相对运动时,就会在接触面上产生一种阻碍相对运动的力,这种力叫做滑动摩擦力.滑动摩擦力F_1的大小跟这两个物体表面间的压力F_N的大小成正比,即F_f=μF_N,式中μ称为动摩擦因数,它的数值跟接触面的粗糙程度有关.从公式可以看出,其公式涉及到力,而力是产生加速度的原因,所以我们可以采用运动学求出加速度,然后根据牛顿第二定律求解;再者,由于力与功也存在着关系,所以我们可以采用动能定理先求出功,燃后根据做功的定义求出动摩擦因数.当然我们可以直接采用
Two objects in contact with each other, when they are to occur or have been in relative motion, will generate a force on the contact surface that impedes the relative movement. This force is called sliding friction. The size of the sliding friction F_1 and the two The pressure F_N between the surface of the object is proportional to the size, that is, F_f = μF_N, where μ is called the dynamic friction factor, and its value is related to the roughness of the contact surface. From the formula, it can be seen that the formula involves force, and force It is the cause of the acceleration, so we can use kinematics to calculate the acceleration, and then solve it according to Newton’s second law. Moreover, because of the relationship between force and work, we can use the kinetic energy theorem to find the work first, after burning The definition of work done finds the dynamic friction factor. Of course we can use it directly.