This study aims to measure the angular velocity of a clock’s second hand and the average angular velocity of a metronome using a smartphone. To determine the angular velocities, the ticking of clock’s second hand and the metronome beats were recorded. The angle between the extreme left and right positions of the metronome’s hand was also measured. Some free smartphone applications for these measurements, e.g. ‘Grandfather Clock,’ ‘Metronome,’ ‘Protractor,’ and ‘Physics Toolbox Sensor Suite’ were used during the study. The results revealed that the smartphone can be a reliable tool in determining the angular velocities of rotating or oscillating objects that emit sound.

这项研究旨在使用智能手机测量时钟秒针的角速度和节拍器的平均角速度。为了确定角速度，记录了时钟秒针的滴答声和节拍器的节拍。还测量了节拍器手的最左端和最右端之间的角度。在研究期间，使用了一些免费的智能手机应用程序进行这些测量，例如“祖父钟”，“节拍器”，“量角器”和“物理工具箱传感器套件”。结果表明，智能手机可以作为确定发出声音的旋转或振动物体的角速度的可靠工具。