1Q20.10 Adjustable Angular Momentum *U of M Favorite*
1Q20.18 Racing Pendula
1Q20.30 Rolling Spool
1Q20.40 Flywheel Car
1Q20.50 Faster than "g" *U of M Favorite*
1Q20.60 Falling Meter Sticks
1Q20.98 PVC Trebuchet
1Q20.99 Tabletop Trebuchet
