Counterintuitive problems in dynamics and vibration

Mechanical Vibration and Dynamics are taught to undergraduates as if they simple sciences. The mass-on-a-spring, uni-axial vibration of a rod, viscous damping, modal analysis - all these are the bread and butter of vibration science. As for rigid-body dynamics undergraduate courses remain fixed in 2-D planar motion. But real dynamic and vibrating systems just don't behave simply. There are pitfalls in even the most ordinary cases and some of these will be demonstrated: a tuning fork; a bottle of coke; a bending beam; a turbocharger wheel, a bouncing ball, a rolling ball and boomerangs. All of these things behave counter-intuitively. The talk accompanying the paper will be filled with practical demonstrations - seeing is believing. Most are demonstrations that can be repeated at home