Abstract
“Girigiri-Garigari” is the Japanese name of a scientific toy which consists of a square rod and a propeller. The wooden rod has several notches along its long edge, and the propeller is loosely attached to one end of the rod by a nail. The propeller is rotated by rubbing the rod with another bar. A player can control the revolution direction of the propeller in two ways, by changing the gripping position or condition of the rod. This paper presents an experimental study on the mechanism of this toy. Main results of this study are that the revolution of the propeller is caused by the elliptical motion excited at the end of the rod, and that the vibration system can be represented by a lumped-constants model. Then, we reveal the mechanism of how the elliptical motion is generated by the player's operations.
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