About HIRAYAMA OSAMU
About school education
About system of particles
About rigid body
About instruction
About teaching material
About science education
About oscillation
About moment of inertia
About pendulum
About acceleration(ratio)
About kinematics
About university education
About 練成振動
About Science and engineering education
About 大学
About 質点系
About 剛体
About 授業
About 演示実験
About 開発
About 質問
About 演示
About 説明
About 段階
About 展開