What is responsible for slowing down the kinetic energy of a roller coaster when the ride is complete?

Because of friction between the coaster cars and the track (not to mention air resistance as the cars move forward at great speed), the amount of mechanical energy available decreases throughout the ride, and that is why the first hill of a roller coaster must always be the tallest.



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Once the cars are put into motion (potential is allowed to be converted into kinetic energy), they will not stop again until the brakes are applied at the end of the ride. The cars are slowed (negative acceleration) eventually to a stop, because of unbalanced forces due to friction acting on them.

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The force of friction acts on the moving cars, decreasing the total amount of mechanical energy in the system. The mechanical energy is not lost, however. It is transformed into thermal energy, which can be detected as an increase in the temperature of the roller coaster's track and car wheels.

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The maximum kinetic energy generated is when the roller coaster is at the bottom of the track. When it begins to go up, the kinetic energy converts to potential energy.

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As they race down the other side of the hill, the potential energy becomes kinetic energy, and gravity takes effect, speeding the cars along the track. Furthermore, while the cars are rolling along the track, the energy from the cars is transferred elsewhere because of friction.

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If the tracks tilt up, gravity applies a downward force on the back of the coaster, so it decelerates. Since an object in motion tends to stay in motion (Newton's first law of motion), the coaster car will maintain a forward velocity even when it is moving up the track, opposite the force of gravity.

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Roller coasters are driven almost entirely by basic inertial, gravitational and centripetal forces, all manipulated in the service of a great ride.

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