今年初,高一班物理期末考试时,我出了这样一道题:“怎样由保守力定义势能”。答案比较简单,一句话:势能增量的负值等于保守力做的功,即△E_p=W_保。但全班有4/5的学生答不出来或不够明确。有一位学生这样回答:“若已知是保守力,那么它所做的功也就是动能的增量就等于这个力乘 Earlier this year, when I took the final physics exam for a high school class, I asked this question: ”How to define potential energy by conservative forces.“ The answer is relatively simple. In one word, the negative value of the potential energy increment is equal to the work done by the conservative force, that is, △E_p=W_Paul. However, there are 4/5 students in the class who cannot answer or are not clear enough. One student responded: ”If it is known to be conservative, then the power it does is that the increase in kinetic energy is equal to this force multiplication.