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功能关系是物理学最重要的关系之一,也是最能彰显物理学逻辑美的关键要素。然而,在现行中学教材司南版《物理》必修2(以下简称为教材)中,为降低动能、势能及相关内容教学难度,增加了学生对动能和势能大小的感性体验,删除了动能和势能表达式的推导,使学习者误认为动能和势能的表达式是通过实验得出的结果。特别的,教材28页第二节《势能的改变》中,还有关于重力做功与重力势能变化量关系的不恰当推导,使学习者对功能逻辑关系造成混乱,本文为此略述拙见。
Functional relationship is one of the most important relationships in physics, and it is also the key element that can best demonstrate the logical beauty of physics. However, in the current Middle School Textbook Division South Division “Physics” Compulsory 2 (hereinafter referred to as “teaching materials”), in order to reduce the difficulty of kinetic energy, potential energy and related content, students’ emotional experience on the size of kinetic energy and potential energy is increased, and kinetic energy and potential energy expression are removed. The derivation of the formula makes the learner mistakenly believe that the expressions of kinetic energy and potential energy are the results obtained through experiments. In particular, in the second section of the textbook, “Changes in Potential Energy,” on page 28, there is an inappropriate derivation of the relationship between gravity work and the change in gravity potential energy, which has caused learners to confuse the functional logic relationship.