Design a crazy roller coaster ride for a marble but make sure it doesn't fly off the track! Did you notice that your starting point had to be the highest point on the course? The higher the starting point, the more potential energy your marble has stored up to use later. When the marble started rolling downward, its potential energy began to change into kinetic energy (the energy of motion). If it has enough energy, your marble will make it up the next hill or even around the loop-de-loop!