Match descriptions to bar charges
http://www.physicsclassroom.com/Physics-Interactives/Work-and-Energy/Work-Energy-Bar-Charts
Match descriptions to bar charges
http://www.physicsclassroom.com/Physics-Interactives/Work-and-Energy/Work-Energy-Bar-Charts
Effect of type of track, friction
http://www.physicsclassroom.com/Physics-Interactives/Work-and-Energy/Roller-Coaster-Model
Conservation of energy
Elastic potential energy