What can we learn about physics from an amusement park ride? This video segment, produced for Teachers' Domain, uses roller coaster footage to demonstrate that what really keeps people pinned to their seats as a roller coaster hurtles through a loop isn't just the seat belts, it's centripetal force. To reinforce this important scientific principle, a physics teacher successfully swings a cup of water around his headwithout spilling a drop.

This video is available in both English and Spanish audio, along with corresponding closed captions.