There's a freefall slide in Texas... its called the Torpedo. I tried it once, they had to close it down for a few hours, to bleach and sanitize it: After I **** my trunks...
roller coaster is not water slide. on a water slide you are pushed by your own wight and gravity. how can gravity push you up? REEEEELEEEAAAAAASEEEE TTTHHHEEEEE RRREEEDDDDDD TTTHHHHUUMMMMBBBSSS!!!!!
Please tell me you are joking. It's the same principle, you start at a high point, and from that point you have a certain amount of potential energy. When you reach a level point on the slide and it starts to become an incline, that energy becomes kinetic energy, giving you force to go upwards.
In simple terms, it's ******* gravity.
Energy can not be created nor destroyed by expending kinetic energy to say climb a flight of stairs to reach the top of a platform you have a certain amount of GPE (gravitational potential energy) which is Mass x Gravity x Height lets say you weigh 70kg and you're at 30 meters. That means 70 x 30 x 9.8(gravity) which is equal to 20580 joules of potential energy. By going down the hill this energy is converted from potential energy to kinetic energy(energy of motion) when reaching the bottom of the hill you now have around 20k joules of kinetic energy and a certain amount of speed. You won't simply stop at the end of the hill and have all that energy disappear. You still have energy and speed so you continue traveling(going up the hill again) until you lose enough energy to friction(this is why they usually have the pools at the end of slides like this.