Answer:
Newton's first law of motion states that an object in motion tends to stay in motion. This is what keeps the roller coaster rolling through the hills and turns after it accelerates down the initial ramp. Also, the riders inside the car will experience changes in accleration and apparent weight. The riders will keep going at the same speed in the same direction unless some other force (the seat) acts on them to change that speed or direction. At the bottom of hills, they try to continue downward, and are pressed into the seat. At the tops, the riders are lifted up in their seats as they try to continue upward even as the seat pulls them down into the next drop. The same thing occurs on turns, where riders are pushed into the side of the seat as the coaster turns. (This is the reason for harnesses, seat belts, and restraining bars.)
Explanation:
