Roller coaster

On wensday we did roller coasters. We used marbles as people. We did loops and big hills on it. Some  of the people could make it go through two loops but they weren't big.  Some people made the marbles go as fast as they could go. At the end we could do what ever we want to do.  I tried to make it go through 3 loops, but it didn't have enough speed to go through all of them.