More physics links for those of you taking physics or reviewing physics for the MCAT 
These are pretty good on concepts whereas the others I posted (a long while back) were good for problem solving explanations.
http://physics.webplasma.com/physicstoc.html
http://theory.uwinnipeg.ca/mod_tech/node1.html
http://www.fearofphysics.com/
Physics as Comics
http://www.geocities.com/physicscomix/frame.htm
and, since Mary has brought up the Tour de France – here are some links about the Physics of Cycling 
Here are a few web pages on the physics of cycling:
http://www.science.uva.nl/research/amstel/…c/Bart/Project/
http://ist-socrates.berkeley.edu/~fajans/T…g/bicycles.html
How to Steer a Bicycle:
http://socrates.berkeley.edu/~fajans/Teach…ng/Steering.htm
Physics of Rowing:
http://www.atm.ox.ac.uk/rowing/physics/
winter sports - skating and luge
http://btc.montana.edu/olympics/physbio/default.htm
some simple biomechanics problems - physics+biology
http://www.nyu.edu/classes/mcdonough/biomech2.htm