Random: Law of Momentum Conservation

A vary cool video of 5 metronomes, usually used when people play the piano for timing. start all off together at different , and what have you got? Well, all will become syncronised when placed on a platform on 2 drink cans

Conservation of momentum
A fundamental law of physics which states that the momentum of a system is constant if there are no external forces acting on the system. It is embodied in Newton's first law (the law of inertia).