一、重力场中的“过山车”模型1.模型介绍如图1所示,光滑圆弧轨道竖直放置,小球可以在内侧轨道做圆周运动,这便是通常说的“过山车”模型.2.“过山车”模型特点(1)如图1所示,若小球在的轨道内作圆周运动, First, the gravity field in the “roller coaster” model 1. Model introduced As shown in Figure 1, the smooth arc orbit placed vertically, the ball can do circular motion in the inner orbit, which is usually said “roller coaster ”Model .2.“ Roller coaster ”model features (1) shown in Figure 1, if the ball in a circular motion within the track,