HOW ROLLER COASTERS WORK
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There are chains that pull you and that run on electricity. They pull you to the top of the hill and the energy changes to potential energy. Gravity pulls on you when you ride down. At the top of each inline you will probably feel weightless. That is because your inertia keeps your body going up as the car races down. The car will come upon a banked turn and suddenly the car makes a steep turn. You might feel like you will fall out of you seat.
Colossus at Six Flags Magic Mountain Taken by Allyn Fratkin
However, when the cars make a steep turn, centripetal force is acting on you pushing you back on the car. If the tracks did not turn the car would go straight and it would fall off the track.
You will go through some really high loops and then your car will come to a sudden STOP!
You might want to know why you don't fall out of the car. Inertia tries to keep you moving in a straight line outwards and the tracks were agent inertia with centripetal force to push the cars around in a circle. Inertia presses your body into your car, even when it is upside down. Friction works very slow and stops you.
If you like roller coasters you would probably feel at home. Many physics are Greek words. Physics is the word nature in Greek.