大学物理 ›› 2016, Vol. 35 ›› Issue (10): 11-16.doi: 10.16854/j.cnki.1000-0712.2016.0140

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力场与时间有关系统的功能定理及其应用

朱如曾   

  1. 中国科学院力学研究所非线性国家重点实验室(LNM)微重力国家实验室(NML),北京 100190
  • 收稿日期:2014-12-01 修回日期:2016-05-13 出版日期:2016-10-20 发布日期:2016-10-20
  • 作者简介:朱如曾(1941— ),男,江苏靖江市人,中国科学院力学研究所研究员、博士生导师,主要从事物理力学等

Work-energy theorem for systems with time related force field and its application

ZHU Ru zeng   

  1. State Key Laboratory of Nonlinear Mechanics (LNM)and Key Laboratory of Microgravity, Institute of Mechanics,Chinese Academy of Science,Beijing 100190,China
  • Received:2014-12-01 Revised:2016-05-13 Online:2016-10-20 Published:2016-10-20

摘要: 与时间有关的有势力场与其他力共同作用系统的功能定理具有比普通的功能定理更为强大的应用价值,本文介绍这一功能定理,并应用于不同参考系观察同一系统的机械能如何变化的两个简单实例:在地面上和升降机中观察地面附近同一质点的机械能变化,在地面上和在运动车厢里看一端固定于车厢壁的弹簧振子的机械能变化.指出了有些文献的有关错误.

关键词: 与时间有关力场, 功能定理, 机械能守恒定理, 重力场, 轻质弹簧振子

Abstract: The work -energy theorem for systems with time related force field possessing potential and other forces has more powerful application value than the ordinary work-energy theorem.This paper plans to introduce the former and apply it to judge whether the mechanical energy relative to different reference systems is conservative for two simple systems:a particle in the gravity field and a light spring oscillator with one end fixed in the moving compartment.

Key words: time related field, work - energy theorem, theorem of mechanical energy conservation, gravity field, light spring oscillator