在物理教学和学习过程中,一题多变和变式练习都是非常重要和有效的教学和学习手段。下面以一道力学题为例,简单说明一体多变的几种方式。源题:如图1所示,用等长的轻绳悬挂两个质量相同的小球,今在两小球上分别施加大小相等、方向相反的水平恒力,则平衡 In physics teaching and learning process, a variety of questions and variant exercises are very important and effective teaching and learning tools. The following to a mechanical problem, for example, a simple description of one of several ways changeable. Source: As shown in Figure 1, with the same length of light rope suspension of two balls of the same quality, respectively, in the two balls were applied equal in size and direction of the opposite horizontal constant force, the balance