This paper demonstrates the use of the sensors of a smartphone in recording experimental data for studying the moment of inertia of a compound pendulum. The smartphone was attached to the beam to record at various points the angular position and angular speed of a compound pendulum. We altered the position of the smartphone along the beam resulting in the change of the system’s moment of inertia. The experimental result agreed with the theoretical calculation. This experiment will stimulate students to conduct such an experiment themselves and helps students understand the relationship between angular speed and its moment of inertia.

中文翻译：

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通过使用智能手机的传感器测量角速度来教授惯性矩

本文演示了智能手机传感器在记录实验数据以研究复合摆惯性矩方面的用途。智能手机安装在横梁上，以记录复合摆的各个角度位置和角速度。我们改变了智能手机沿光束的位置，从而导致系统的惯性矩发生了变化。实验结果与理论计算吻合。该实验将激发学生自己进行这种实验，并帮助学生了解角速度与其惯性矩之间的关系。