Amusement park rides use several concepts from physics. The roller coasters and water rides lift you up and then drop you down so that you move fast. The lifting you up part gives you potential energy and the droping you down part changes that potential energy into kinetic energy.
Kinetic energy is energy of motion.
All rides use Newton's Laws. One law says that bodies in motion tend to stay in motion unless pushed by something else. Imagine a loop on a roller coaster. Your body wants to move forward but the roller coaster train is trying to move up. The seat pushes us in a new direction.