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This study developed an online observable augmented reality dynamics experimental system that can be used in the current COVID-19 pandemic, where face-to-face experiments are difficult to conduct. The developed system enables the broadcast of mass point and rigid body measurements using an online depth camera, and remote observation using mobile devices. The mass point measurement enables students to quantitatively analyze results by utilizing 2D projected trajectories. Students can view the virtual trajectories by modifying the gravity or restitution coefficient, which is not possible in real experiments. The complex motion of the rigid body can be shown separately as the motion of the center of gravity and the moment of inertia with respect to the center of gravity. [ABSTRACT FROM AUTHOR]

We developed a three-dimensional motion tracking system that displays trajectories as augmented reality in real time on a tablet device. The features of this system are as follows: (1) the three-dimensional trajectory can be observed from any direction. (2) Velocity and acceleration can be visualized as augmented reality. The device consists of an Intel D435, a spatial recognition camera, and a Raspberry Pi 4 for data processing and transferring. The data are broadcasted to tablet computers, allowing simultaneous observation from multiple tablet devices. The sampling rate of the detection is 8 fps with a measurement error of 1.2%. Since even a general-purpose tablet device can be used to visualize trajectories as augmented reality with this motion-tracking system, it can be widely applied in the study of dynamics in physics from the junior high school to the university level. [ABSTRACT FROM AUTHOR]