Google naar: "Coupled Harmonic Oscillators"
http://webstaff.itn.liu.se/~jonbe/fou/dida...s/Dickinson.pdf
http://www.icpress.co.uk/etextbook/p352/p352_chap1.pdf
http://www.falstad.com/coupled/
http://physics-animations.com/Physics/English/link_txt.htm
http://www.myphysicslab.com/dbl_pendulum.html