What trends do you notice from the bar graphs? (The total is always kinetic energy plus potential energy.) The law of conservation of energy states that energy cannot be created or destroyed but can be transformed into another form. How can this be used to describe the skater’s energies as he moves up and down the track? Make sure you describe the relationship between K. E. and G. P.E.

Have you noticed that the skater does not slow down or stop? Why do you think this is?

What effect do you think adding friction to the track will have on the energies involved?

Will the result still follow the law of conservation of energy?