等效法是指在效果相同的条件下,把实际的、复杂的物理过程或现象变换成理想的、简单的过程或现象来研究处理的方法.等效的思维方法是应用知识解决物理问题的有力工具,在长度测量中同学们初步领略了它的风采:利用一根弹性不大的柔软棉线代换地图上所画的弯曲的铁路线,从而测出了 Equivalence refers to the method of transforming actual, complex physical processes or phenomena into ideal, simple processes or phenomena to study and deal with under the same conditions. The equivalent way of thinking is to apply knowledge to solve physical problems. In the measurement of the length of the tools, the students first learned about its style: using a flexible little cotton thread to replace the curved railway line drawn on the map, and then measured