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在物体的平衡问题中,大多存在动态问题,所谓动态平衡问题,就是通过控制某一物理量,使物体的状态发生缓慢变化.解决动态平衡问题要通过变中找不变、以不变应万变,通常有两种方法.一、解析法对研究对象的任一状态进行受力分析,建立平衡方程可得物理量的一般函数式,然后根据自变量的变化确定应变量的变化.例1重量为C的木块与水平地面间的动摩擦因数为μ,一人欲用最小的作用力F使木块做匀速运动,则此最小作用力的大小和方向应如何?
Among the balance problems of objects, most of them have dynamic problems. The so-called dynamic balance problem means that the state of objects changes slowly by controlling a certain physical quantity. To solve the problem of dynamic balance, , Usually there are two methods.A analytical method to analyze the force of any state of the object of study to establish the general function of the equilibrium equation can be obtained physical variables, and then determine the change of the dependent variable according to the change of independent variables.Example 1 The weight of C of the wooden block and the level of the dynamic friction coefficient between the ground μ, a person want to use the smallest force F to make uniform movement of wood, then the minimum force size and direction should be?