Yes, and if you are in a roller coaster with only one short car, the people in the front and back seats will have a very similar experience. But the longer the train is, the bigger the difference between the physics affecting the front and the back depending on the roller coaster element you are talking about. For example, if you are on a roller coaster with many cars, the front will be going at a different speed when entering a loop than the back car will when it gets to the same point since the act of entering a loop will slow the train down and then exiting the loop will speed it back up. These speed changes are not experienced in the same way for the front and back of the train because they will be at different points in the loop when the speed changes occur. Depending on the size and shape of the loop as well as what came before and what comes after you might find that the front is a more intense experience and sometimes it’s the back. It all depends. It’s just physics.