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在物理教学过程中,经常看到一些课本和教师在解答例题和习题列式时,物理量字母前面的正负号选取随意取,依据不明确。式中表示物理量的字母是矢量的哪一种状态没有交代清楚,等到求解物理量的字母前出现负值时,才意识到物理量的状态,才加以说明负值的意义。结果列式方法不简便,也出现表示物理量状态的混乱。可以通过例题的解答总结列式的方法,解释每种方法的列式依据,并说明哪一种方法比较简便。
In the process of physics teaching, we often see some textbooks and teachers answer the questions and exercises in the formula, the physical quantity of letters in front of the sign to choose freely, based on not clear. In the formula, the letter of the physical quantity indicates which state of the vector has not been clearly explained. When the negative value is found before the letter of the physical quantity is solved, the state of the physical quantity is realized and the meaning of the negative value is explained. The result column method is not easy, but also shows the confusion of the state of the physical quantity. Through the example of the solution to summarize the column method, explain each method based on the column, and explain which method is relatively simple.