等效” ,顾名思义 ,即“效果相当”。等效法 ,指在解题中 ,在效果相当的前提下 ,将实际的、复杂的物理研究对象或物理过程变换为简化的等效物理对象或物理过程的思维技巧 ,使问题得到简化 ,便于解决。1　物理模型的等效例 1　半径为R的绝缘光滑圆环 ,固定在竖直平面内 ,环上套? Equivalent, as the name implies, that is, “the effect is equivalent.” Equivalent method means that in the problem solving, under the premise of equivalent effect, the actual, complex physical research object or physical process is transformed into a simplified equivalent physical object or physics The process of thinking skills, so that the problem is simplified and easy to solve.1 The physical model of the equivalent example 1 radius R is an insulated smooth ring, fixed in the vertical plane, the ring sleeve?