Deptartament de Sonologia

This is actually a demonstration of damped harmonic oscillation. The metronome needles are at the same speed & the only variable left is time. When he adds the board there is a transfer of angular momentum because of the phenomenon of Angular momentum as a generator of rotation. As the soda cans move, angular momentum is being transferred from the needle, to the system & cans. This transfer of angular momentum is the damping force. This & conservation of angular momentum makes the needles sync

World Science Festival 2009: Bobby McFerrin Demonstrates the Power of the Pentatonic Scale from World Science Festival on Vimeo.