Prototype Links
Young's Theory
http://members.tripod.com/~vsg/interfer.htm
http://theory.uwinnipeg.ca/physics/light/node9.html
http://webphysics.ph.msstate.edu/jc/library/24-3b/
Gravity
http://www.curtin.edu.au/curtin/dept/phys-sci/gravity/
http://hyperphysics.phy-astr.gsu.edu/hbase/grav.html
http://www.edu.pe.ca/southernkings/zerogravity.htm
Pendulums
http://www.sciencentre.qld.gov.au/sciencentre/exhibits/permanent/pendulum/pendulum.htm
http://research.microsoft.com/~rcutler/periodic/periodic_motion.htm
http://www.fearofphysics.com/Zerog/pend.html
http://www.hazelwood.k12.mo.us/~grichert/sciweb/accelg.htm
http://www.mines.edu/fs_home/tboyd/GP311/MODULES/GRAV/NOTES/pend.html