It's a very easy effect to feel. > At this point, the last car still has not been passed the point of tightest radius. When it does pass, it will be travelling

It's a very easy effect to feel. > At this point, the last car still has not been passed the point of tightest radius. When it does pass, it will be travelling quicker and thus experience a higher acceleration. Find a coaster without a long line and ride it twice in quick succession, once from the very front and once from the very back. On almost any coaster from the back row you should be able to feel the sensation of being pulled over the crest of a hill as the front carriages pick up momentum. I think the back is often a better ride on most coasters. (The front is good on suspended coasters though. No one in front of you blocking your view, and loops will often have the track disappear entirely out of your view which is quite an odd experience.)