What makes a successful roller coaster

What makes a successful roller coaster is the rail that hold it so when it might make a loopy loop, it will not fall over and squish all the people to the ground.

But before someone makes a roller coaster they always have to use a test dummy (a robot) so you can test the roller coaster out.

Here is what I found:

"A roller coaster is an amusement ride developed for amusement parks and modern theme parks. LaMarcus Adan Thompson obtained a patent regarding roller coasters on January 20, 1885, which were made out of wood, but this patent is considerably later than the "Russian mountains" described below. In essence a specialized railroad system, a roller coaster consists of a track that rises in designed patterns, sometimes with one or more inversions that briefly turn the rider upside down. The track 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."

Hope this helped! :D :)

I included a picture so you can see the railing in how it is to not let the people fall when they are riding. :)

What is the question? if you were looking to design a method of separating something, you can separate this compound by putting both in water and allowing the water to dissolve the sugar. then pour it into another beaker and evaporate it then boom! salt and sugar : ) 

Adaptatio