Water slides operate on the same premise. You have a stairs instead of a lift hill. This means that it can accelerate you faster when you ride it. Lifts use momentum gained by climbing to rotate a car or other device down another slope called a lift hill or launch pad. The car is then released and begins its descent under its own power. Lifts are used at parks and resorts to bring people into the park, but they can also be found in theme parks, such as Disney's Typhoon Lagoon and Universal's Volcano Bay. Water slides use inertia to propel you down the slide. As you climb the stairs, your body weight pulls them tighter. At the top of the slide, your body weight has been removed from the stairway, so it tightens up again as you begin your descent. This effect alone is enough to send you flying down the slide. The speed you travel down a water slide depends on two factors: how many steps there are and how steep they are. Steeper steps will cause you to go faster. There are also hydroslides, which are similar to water slides except that they use moving water rather than gravity to propel riders down the slide.