1直线轨道与曲线轨道请看下面这样一个问题:可看作质点的小球自光滑轨道的顶端A处沿不同路径运动到底端B,如图1所示.问1、2、3中沿哪条路径所用时间最短?上述问题是历史上有名的“最速降落”问题,我们先应用定性和半定量的方法分析:图1图2图3(1)小球在轨道2上加速度恒定,沿斜面 1 Linear orbit and curved orbit See the following question: The small sphere that can be seen as a particle moves from the top A of the smooth track to the bottom B along different paths, as shown in Figure 1. What is the shortest time for the path? The above problem is historically famous as the “speed drop” problem. We first apply qualitative and semi-quantitative methods: Figure 1 Figure 2 Figure 3 (1) The ball has constant acceleration on track 2 along the slope