“物理教学”1990年4月号题为“力作用的瞬时效应和累积效应”一文例3的解答是自相矛盾的,不成立的。借此机会,笔者谈一点力作用瞬时效应处理的管见。原题为:质量分别为m_1、m_2、m_3的三个小球,中间均由长为l的绝缘细线连接。其中m_2带+q的电量,m_1、m_3不带电,线的质量、空气阻力均不计。当突 The “Physics Teaching” April 1990 issue entitled “The Instantaneous Effects and Cumulative Effects of Force Effects” is a self-contradictory and untenable answer. To take this opportunity, the author talked about the point of view of the role of transient effects processing. The original title is: three balls whose masses are m_1, m_2, and m_3, respectively, connected by insulating filaments of length l. Among them, m_2 carries the charge of +q, and m_1 and m_3 have no electricity, and the quality of the line and the air resistance do not count. When suddenly