Back Hweogolrǣsere ANG أفعوانية Arabic Monte rusu AST Muntanya russa Catalan Horská dráha Czech Trên Rola-bola Welsh Rutsjebane Danish Achterbahn German Roller coaster English Onda fervojo Esperanto
A roller coaster (some people say the simple form coaster) is an amusement park ride. A roller coaster is usually a small train. It has a number of carriages that travel on a track. This track has hills that go up and valleys that go down. Sometimes it has other features that will turn the train upside-down. The track can be made from wood or steel. Some roller coasters are made for children, so they do not travel very fast. Other roller coasters are made very tall and they travel very fast. Riders are generally held in place with a bar, a belt, or something similar.
Scientifically, a roller coaster works because of gravity, a force that pulls things down to the ground. Most roller coaster trains are pulled to the top of a hill on a chain. The train will slide down the track, which has a number of hills and valleys. As it slides downhill it goes faster, and it slows down when climbing.