许多物理问题中的物理量经常是随时间变化的,其中物理量的函数图线斜率变化的情况较为复杂,但如果能把握变化过程中的一些转折点,就能很快找到解决问题突破口!常见的转折点有拐点和驻点等.驻点是指函数的一阶导数为零的点.驻点可以划分函数的单调区间,在驻点之前函数曲线持续上升 The physical quantities in many physical problems often change over time, and the changes in the slope of the function plot of the physical quantities are complicated, but if you can grasp some of the turning points in the process of change, you can quickly find a breakthrough to solve the problem! Common turning points are Inflection point and stagnation point, etc. The stagnation point refers to the point where the first derivative of the function is zero.The stagnation point can divide the monotonous interval of the function, and the curve of function continues to rise before the stagnation point