Since by Newton’s first law of motion, an object in motion tends to stay in motion, the coaster car will maintain a forward velocity even when it is moving up the track, opposite the force of gravity. Thus, roller coasters would be able to keep going up hills and converting potential energy to kinetic energy constantly.
Body sensations are also explained. From Newton’s first law of motion, it says that your body will keep going at the same speed in the same direction unless some other force acts on you to change that speed or direction. So when the coaster speeds up, the seat in the cart pushes you forward, accelerating your motion. When the cart slows down, your body naturally wants to keep going at its original speed, thus the harness in front of you accelerates your body backward, slowing you down. You would then feel yourself pressed against the restraining bar as the roller coaster speeds up or slows down.
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