基于手机Phyphox软件测量刚体转动惯量  

Measuring the Moment of Inertia of Rigid Body based on Phyphox software

作　　者：刘梦林 齐敬强 LIU Menglin;QI Jingqiang(Weihai Campus,Beijing Jiaotong University,Weihai,Shandong 264401,China)

机构地区：[1]北京交通大学威海校区,山东威海264401

出　　处：《大学物理实验》2025年第1期100-104,共5页Physical Experiment of College

基　　金：北京交通大学威海校区教学改革和建设项目(911011522)。

摘　　要：在落体法测量刚体转动惯量的实验装置的基础上安装两块磁铁,利用手机Phyphox软件中的“磁力计”选项测量载物台旋转时磁场随时间变化的数据,以此确定载物台转过的角度随时间变化的数据并计算出载物台的角加速度,进而计算出系统的转动惯量。此方法测得圆盘、圆环和圆柱试样的转动惯量的相对误差均小于1%。通过无线网络可以将手机和电脑互联,实验数据以图表的形式实时显示在电脑桌面,实验过程更直观。On the basis of the experimental device for measuring the moment of inertia of rigid body using the falling body method,two magnets are installed.The"magnetometer"option in the mobile phone Phyphox software is used to measure the data of the magnetic field variation over time when the stage rotates.Based on this data,determine the change in the angle of rotation of the stage over time and calculate the angular acceleration of the stage,thereby calculating the system′s moment of inertia.The relative error of the moment of inertia measured by this method for disc,ring,and cylindrical specimens is less than 1%.Through wireless networks,mobile phones and computers can be interconnected,and experimental data can be displayed in real-time in the form of charts on the computer desktop,making the experimental process more intuitive.

关 键 词：落体法 转动惯量 角加速度 Phyphox 

分 类 号：O4-34[理学—物理]