Development of the systematic physics demonstrations which promotes an understanding of a physical concept at a university lecture, and real-time evaluation

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We have been developing interactive lecture demonstrations that help students grasp the concept of physics. Our observations show that students think actively and can logically explain an underlying physical law when visual demonstrations are introduced in sequence. For that purpose, it is necessary to arrange a series of experiments intentionally so that proper information may be given to students in each stage.For example, our developed demonstrations successfully visualize the difference between mass and weight. We show clearly that logical relation between the period of a pendulum and a moment of inertia, by comparing a simple pendulum with a rigid body pendulum.