<P> A roller coaster is a type of amusement ride that employs a form of elevated railroad track designed with tight turns , steep slopes , and sometimes inversions . People ride along the track in open cars , and the rides are often found in amusement parks and theme parks around the world . LaMarcus Adna Thompson obtained one of the first known patents for a roller coaster design in 1885 , related to the Switchback Railway that opened a year earlier at Coney Island . The track in a coaster design does not necessarily have to be a complete circuit , as shuttle roller coasters demonstrate . Most roller coasters have multiple cars in which passengers sit and are restrained . Two or more cars hooked together are called a train . Some roller coasters , notably wild mouse roller coasters , run with single cars . </P>
<P> A roller coaster is a type of amusement ride that employs a form of elevated railroad track designed with tight turns , steep slopes , and sometimes inversions . People ride along the track in open cars , and the rides are often found in amusement parks and theme parks around the world . LaMarcus Adna Thompson obtained one of the first known patents for a roller coaster design in 1885 , related to the Switchback Railway that opened a year earlier at Coney Island . The track in a coaster design does not necessarily have to be a complete circuit , as shuttle roller coasters demonstrate . Most roller coasters have multiple cars in which passengers sit and are restrained . Two or more cars hooked together are called a train . Some roller coasters , notably wild mouse roller coasters , run with single cars . </P>
what is the purpose of a roller coaster
what is the purpose of a roller coaster
amusement
amusement