Does a roller coaster obey the law of conservation of energy?

Roller coasters, like everything else, must obey the law of conservation of energy, meaning the train can only go as fast and as far as the amount of stored (potential) energy allows. Potential energy usually comes from lifting the train up a hill with a chain or cable.



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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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In roller coasters, the two forms of energy that are most important are gravitational potential energy and kinetic energy. Gravitational potential energy is the energy that an object has because of its height and is equal to the object's mass multiplied by its height multiplied by the gravitational constant (PE = mgh).

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A roller coaster demonstrates kinetic energy and potential energy. A marble at the top of the track has potential energy. When the marble rolls down the track, the potential energy is transformed into kinetic energy. Real roller coasters use a motor to pull cars up a hill at the beginning of the ride.

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Summary. Students explore the physics exploited by engineers in designing today's roller coasters, including potential and kinetic energy, friction and gravity.

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Roller coasters are driven almost entirely by inertial, gravitational, and centripetal forces. There are three main components to the typical roller coaster: chain lift, catapult-launch lift, and the brakes. The chain lift is the component that pulls all the carts to the “top” of the roller coaster.

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