intro to circular motion
Lesson on circular motion ad forces
http://www.youtube.com/watch?v=bu7UkIbPXz4
Hewitt discusses centrifugal force
http://www.youtube.com/watch?v=Sav9vQ663u4
extreme biking with banked cures
Speed skating
http://www.youtube.com/watch?v=Zzyt0e_fJII
speed skate wipeout Slow mo
un-expected gold (go to 1:30)
indoor cycling go to 1:25
indoor cycling go to 1:00
Physics of Skating
extra practice problems with guided solutions
Space station