Practical Application A ball at the top of the Great Gravity Clock has potential energy and once the ball rolls down the track it has kinetic energy. Real World Examples Potential and kinetic energy can be observed in a catapult, a playground swing or slide, and dropping in on a half pipe while skate boarding. Challenge Yourself Make a Marble Run by using masking tape, pool noodles and a marble. By adjusting the height at the start of your rollercoaster, see how far and fast you can make your marble go. Roller-coaster engineers use the simple concepts of potential and kinetic energy to turn their designs into an exciting reality. Did You Know ? AT HOME EXPERIMENT Exhibit Key Concept Potential and Kinetic Energy