Other places where we can learn about simple harmonic motion include:
HyperPhysics: http://hyperphysics.phy-astr.gsu.edu/hbase/shm.html Simple Harmonic Motion at the University of Guelph: http://www.physics.uoguelph.ca/tutorials/shm/Q.shm.html Spring Simulator: http://phet.colorado.edu/simulations/sims.php?sim=Masses_and_Springs Circular Movement Simulator: http://phet.colorado.edu/simulations/sims.php?sim=Ladybug_Revolution
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Alesa Rabson & Maria Forero - Simple Harmonic Motion