search for Power Tower and click the 3rd or 4th link.
Or click this link http://www.nasa.gov/audience/forstudents/5-8/features/defy_gravity.html
On the related multimedia click the two links. One is called Coasters and Shuttles and the other is called Power Tower Physics.
~~~~Coaster Lover~~~~~~~~~~
I dunno, I think its neat how they use rides for examples on the NASA site.
- Josh
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