Swings, pendulums, parametric resonance and all that. More at: http://youtu.be/eY-SWHMCakY And slow motion at: http://youtu.be/tZKVrK-3efY Featuring Professor Roger Bowley. Want to dig even deeper - Professor Bowley recommends reading Classical Mechanics by Leonard Susskind and George Hrabovsky - http://bit.ly/classicalmechanicsbook Visit our website at http://www.sixtysymbols.com/ We're on Facebook at http://www.facebook.com/sixtysymbols And Twitter at http://twitter.com/#!/periodicvideos This project features scientists from The University of Nottingham http://www.nottingham.ac.uk/physics/index.aspx Sixty Symbols videos by Brady Haran A run-down of Brady's channels: http://bit.ly/bradychannels