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北京大学物理系蔡一坤等同志撰写的“物体质量可变情况下的牛顿第二定律”一文在本刊1982年第二期上发表后,我们陆续收到了一些读者来信及来稿,对该文提出了一些问题及不同看法,因为涉及问题比较集中,因此将部分来信来稿转给了该文作者,作者对读者的问题作了答复,现将作者给编辑部的来信刊出,供读者参考。我们对来信、来稿的许多读者,以及热忱关心本刊的广大读者表示衷心的感谢。关于上文的一些问题读者亦可进一步参考:梁昆淼《力学》上册;瑞斯尼克等《物理学》第一卷第一册。
The article “Newton’s second law under variable object quality” written by Cai Yikun’s Department of Physics at Peking University was published in the second issue of the magazine in 1982. We received a number of letters from the reader and the manuscript. Some questions and different opinions were raised. Because the issues involved were relatively concentrated, some of the submissions were sent to the authors of the papers. The authors responded to questions from the readers. The authors are now posting to the editorial office for reference. We express our sincere gratitude to many readers of letters, contributions, and readers who are enthusiastic about this publication. Readers may also refer further to the above questions: Liang Kunxi’s “Mechanics” book; Resnick et al. “Physics” Vol.