A Model Science Experiment to Capture the Relationship Between Raindrop Radius and Terminal Velocity Using a Smartphone’s High-speed Camera

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  • TAKIMOTO Ieyasu
    Science Course, Cooperative Faculty of Education, Utsunomiya University

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  • スマートフォンのハイスピードカメラを活用した雨滴の半径と終端速度の関係を捉えるモデル実験

Abstract

<p>We designed an experiment that can be easily conducted in the classroom to find the relationship between raindrop size and terminal velocity, as an experiment to be conducted by Science course in the Faculty of Education who aim to become science teachers in the future. Styrofoam balls of different radii were used as raindrop models, and their falling velocities were measured using the high-speed camera function of a smartphone. The results demonstrated that the theoretical and measured terminal velocities generally agreed with each other (mean relative error 3.7%), indicating that terminal velocity is proportional to the square root of the radius. To verify the effectiveness of the developed experiment as a teaching tool, a trial practice was conducted with university students, and their understanding of terminal velocity were recorded before and after the practice. The results suggest that the experiment enhances the students’ understanding of terminal velocity.</p>

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