Here are some photos from Don Scholl's Momentum/Work/Energy workshop

This photo shows the meter sticks hanging out to side,
only sometimes a weight would break the string.




Cart went down the ramps and crushed aluminum cans.




Don is using Pasco carts to demonstrate elastic
and inelastic situations.




The next five photos show participants designing, making and testing
various designs so their cart would not crush an aluminum can
as much as the carts did earlier without the bumpers.