利用智能手机拍摄功能测量刚体的转动惯量

The Measurement of Moment of Inertia of Rigid Body Via the Shooting Function of Smartphone

详细讨论落体法测转动惯量实验中下落时间和落体质量的关系,提出利用手机“慢动作”拍摄功能记录刚体的转动,并根据拍摄视频的时间线读出刚体的角位置,再用Origin处理数据拟合曲线获取刚体的角加速度,从而得到刚体的转动惯量。该测量方法与传统测量方法相比更简便、测量精度更高,对于改进大学物理实验教学具有重要意义。

The relationship between falling time and falling body mass in the experiment of measuring moment of inertia with falling body method is discussed.A novel approach is proposed to measure moment of inertia where the slow-motion shooting function of Smartphone is employed to capture the rotation of rigid body,then the rigid body angle location can be obtained according to the time line of the video.Using Origin to process data,fitting curve to obtain the angular acceleration of rigid body,finally obtain the moment of inertia of the rigid body rotation.Compared with the traditional measurement method,the measurement method is more simple and more accurate,which is of great significance for improving the teaching of physics experiment.