牵引问题是高中物理常见的一类问题,而该类问题中有两个模型非常容易混淆,下面从两个模型各自的结构特点入手,对模型进行辨析与区分.模型1:如图1所示,滑块A置于光滑水平桌面上,细线一头与滑块相连接,连接点为B,另一头绕过定滑轮,当以速度v拉绳头时,滑块A沿水平面向右运动.模型2:如图2所示,滑块A置于光滑水平面上与动滑轮相连,一根轻绳绕过两滑轮后固定在C Traction problem is a common type of problem in high school physics, and two models of this type of problem are very easy to confuse. The following is to start with the structural characteristics of the two models to distinguish and distinguish the model. Model 1: as shown in Figure 1. Slider A is placed on a smooth horizontal table. The thin wire is connected to the slider at one end. The connection point is B. The other end passes around the fixed pulley. When pulling the rope at the speed v, the slider A moves to the right along the horizontal direction. Model 2: As shown in Fig. 2, the slider A is placed on a smooth horizontal surface and is connected with the moving pulley. A light rope is fixed on the C after passing around the two pulleys.