As the coaster goes through its twists, turns, rolls, and loops, it gains and loses speed and its initial potential energy (supplied by dragging it up the first hill) changes from potential into kinetic energy and back into potential energy.
(the coaster; goes; through its twists, turns, rolls, and loops) (it; gains; ) (it; loses; speed and its initial potential energy (supplied by dragging it up the first hill) changes; T:As the coaster goes through its twists, turns, rolls, and loops)
the coaster it it
goes gains loses
through its twists, turns, rolls, and loops
speed and its initial potential energy (supplied by dragging it up the first hill) changes T:As the coaster goes through its twists, turns, rolls, and loops