I have a lab in which a moving marble collides with a still one. What changes could I make to reduce the amount of kinetic energy loss in the collision? The track for the marbles is a piece of card stock paper. I was thinking: -Use two tubes as a track which will reduce the amount of friction on the marble and prevent a glancing collision. How would I eliminate energy loss to sound and heat? Any ideas? Any other ideas for reducing ek loss as well?