摘要：The purpose of this study was to create and evaluate an educational magnetic top. The experiment was conducted with elementary school children at the Youngsters’ Science Festival in Matsuyama, Japan. In order to evaluate the study, an open-ended questionnaire was created. Upon receiving permission from parents, 139 elementary school children were surveyed, which included 56 students from the lower grades, 54 students from the middle grades, and 29 students from the upper grades. The survey was analyzed using the text mining technique. As a result, three important results were gathered: 1) it became clear that most students in the middle grades stop feeling like they were bad at the screw tightening; and 2) Most students in the upper grades that had experience in motor learning, students tended to be able to adequately explain the principle of screw tightening; and 3) As long as students learn about the principles of motors, the teaching materials that are proposed in this study can be used to describe complex principles to students in all elementary school grade levels.
关键词：magnetic top; text mining; screw tightening; scientific principles
