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Stuart, great idea! 
The sand could be set against a graphic that shows the paths of travel at
different launch speeds.  Next to the sand, add a stream of water to compare
the path of particles with that of a fluid.
 
As for measuring the speed of a steel ball, mount two light sensors a known
distance apart.  Measure the time as the ball blocks one light sensor, then
the other.  A common setup for high school physics experiments.  

-Eric
 

*****************************************
Eric Yuan
Exhibit Developer
Children's Museum of Portsmouth
280 Marcy Street
Portsmouth, NH 03801
(603) 436-3853
www.childrens-museum.org 
*****************************************


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