This classic 'executive toy' also demonstrates various physical principles. These include conservation of momentum, conservation of kinetic energy and Newton's observation that 'action and reaction are equal and opposite'.
- When one of the steel balls is lifted and allowed to fall back at one end, one will swing out the same distance at the other end
- This causes the beginning of 'perpetual motion' which dies down only as a result of friction, gravity and other external forces
- Always an interesting process to watch
- Height 11cm