倪彬同学原是湖南师大附中学生,我国第26届国际奥林匹克物理竞赛中国代表队队员,竞赛获金牌,今年5月,代表队在集训期间,倪彬同学自编了一些好题目,这里选出其中一道适合中学教师和学生参考的力学题,经参赛代表队领队、总教练舒幼生教授补充、整理,执笔成文,本刊在此发表,以飨读者. Ni Bin was originally a student at the middle school of Hunan Normal University and was a member of the 26th China International Olympiad Physics Contest in China. The competition won a gold medal. In May of this year, during the training, the Ni Bin classmates made some good topics for themselves. One of the mechanics questions that is suitable for secondary school teachers and students is supplemented, organized, and written by the team leader and head coach Professor Shu Yousheng. This issue is published here to readers.