力学与实践 ›› 2019, Vol. 41 ›› Issue (2): 244-246,243.DOI: 10.6052/1000-0879-18-011

• 力学纵横 • 上一篇    下一篇

树枝上的小鸟——趣说刚体平衡1)

张伟伟*,2), 薛书杭, 王志华**   

  1. *太原科技大学力学系, 太原 030024;
    山西大学附属中学,太原 030006;
    **太原理工大学力学学院,太原 030024
  • 收稿日期:2018-01-03 出版日期:2019-04-20 发布日期:2019-05-31
  • 通讯作者: 2)张伟伟,副教授,主要研究方向为结构损伤检测方法、力学史与方法论。 E-mail: zwwps@tyust.edu.cn
  • 基金资助:
    1)山西省高等学校教学改革创新(J2017160)资助 项目

RIGID EQUILIBRIUM AS EXEMPLIFIED BY BIRDS STANDING ON A BRANCH1)

Zhang Weiwei*,2), Xue Shuhang, Wang Zhihua**   

  1. *The Department of Mechanics, Taiyuan University of Science and Technology, Taiyuan 030024, China;
    The Affiliated High School of Shanxi University, Taiyuan 030006, China;
    ** The College of Mechanics, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2018-01-03 Online:2019-04-20 Published:2019-05-31

摘要: 为了提高理论力学课堂的趣味性,本文以树枝上小鸟作为刚体平衡的例子,应用力的平行四边形法则、力的可传性、三力平衡汇交定理等基本原理分析了树枝上小鸟的双腿受力,以及啄木鸟尾巴在保持身体平衡中的作用,并讨论了小鸟不同姿态对其受力的影响,期望达到提高学习兴趣、寓教于乐、改善教学效果的目的。

关键词: 刚体平衡, 静力学, 理论力学

Abstract: To enhance the students' interest for studying Theoretical Mechanics, two teaching cases of static equilibrium are designed in this paper, as the static analysis for birds standing on a branch. Some knowledge points, such as the parallelogram of force, the transmissibility of force, the three-force balance intersecting principle and the conditions of rigid body equilibrium, are used to analyze the forces on the bird' legs on a branch; and the function of the woodpecker tail when it pecked the worm. It is a very enjoyable and educational experience for the students, and can raise students' interest in learning and improve teaching results.

Key words: rigid equilibrium, statics, theoretical mechanics

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