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When a roller coaster starts, it moves away from its reference point. Because the coaster usually starts off by going up a steep hill the cart is moving farther and farther away from its stationary reference point or where it started. When a roller coaster displays this its called motion. When the coaster is going up the first hill, which is always the tallest, this is when it has the most gravitational potential energy or GPE. Then after the first steep hill reaches the top it has the most momentum which makes it rush down the hill extremly fast. When the cart is racing down the track, as soon as it goes over that hill, the GPE is converted to mechanical energy. Because all the carts on a roller coaster have the same mass, Newton’s 2nd Law comes into place. Depending on the acceleration, change in direction or speed, the coaster will go farther and faster when a larger force is put upon it. G-forces in rollercoaster are what make them fun! Being at the top of a hill gives you negative G-forces which make you feel weightless because you don't feel gravity. You feel positive G-forces when you reach the bottom of that hill and gravity catches up with you. People get the most thrill with positive G-forces. Newton’s 1st Law comes into play throughout the whole rollercoaster. This law is displayed because the cart will keep going at a constant speed and direction unless an unbalanced outside force is acted upon in. An example of this would be, inversions, friction of the wheels, turns, etc. Also the ride won’t start, and will say at the same place and won’t move, unless it starts. Propulsion makes rides more thrilling for the passenger.The system eliminates the need for traditional hill and chain starts that slowly pull cars upward to the coaster's actual starting points. With magnetic propulsion, cars instantly reach the necessary speed that continues throughout the ride. The seat of the roller coaster keeps you in when you're body is resisting change. This is demonstrated as inertia. Throughout the whole roller coaster Newton’s 2nd Law is always in act through out the roller coaster ride. The action of the force from the cart being on the track have both and opposite and equal reaction, meaning that they stay balanced and keep each other from sinking in the ground. Lastly, throughout a roller coaster you can’t feel velocity but you can feel a change in velocity.