考虑绳及圆盘质量时对Atwood机运动的影响  

Effect of massive string and pulley on the motion of Atwood machine

作　　者：王婕[1] 贺西平[1] WANG Jie;HE Xi-ping(School of Physics&Information Technology,Shaanxi Normal University,Xian,Shaanxi 710119,China)

机构地区：[1]陕西师范大学物理学与信息技术学院,陕西西安710119

出　　处：《大学物理》2020年第5期62-65,共4页College Physics

基　　金：国家自然科学基金(11774211);陕西师范大学教学改革项目资助。

摘　　要：求解Atwood机动力学问题,教材中通常把绳子及滑轮当做理想模型(不考虑它们的质量).本文利用动力学的方法,考虑了Atwood机中滑轮、绳的质量,对其实际情况下的运动进行了求解,分析了两者质量及重物的初位移对系统运动的影响,指出了与理想模型之间的差异.The string and pulley are often used as ideal models(e.g., Atwood machine with a massless pulley and a massless string) in textbooks to solve the dynamics problem of Atwood machine. The dynamical methods are used to describe the motion of Atwood machine with a massive string. The effects on the system motion caused by the mass of the pulley, the mass of the massive string and the initial position of the weight are analyzed. Furthermore, the difference between the ideal model described in the text book and the motion of the Atwood machine under the real conditions is discussed.

关 键 词：Atwood机 滑轮 粗绳 动力学 

分 类 号：O313.2[理学—一般力学与力学基础]