This video demonstrates that the displacement of a simple harmonic oscillator can be written down in several, mathematical equivalent ways including a rotating vector in the complex plane called a phasor. It also shows the solution for a vertical mass-spring system.
This video lecture series by Prof. Roger Moore from the University of Alberta includes both screencast lectures, as well as comprehensive laboratory experiments to explain a whole range of topics in fluid mechanics and wave motion. The lectures are all offered in HD quality.
Major topics include: elasticity, fluid statics, fluid dynamics, oscillations, and waves.