What is the basic science behind how a rollercoaster functions?

The combination of gravity and inertia, along with g-forces and centripetal acceleration give the body certain sensations as the coaster moves up, down, and around the track. The forces experienced by the rider are constantly changing, leading to feelings of joy in some riders and nausea in others.



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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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Roller coasters are designed to run on two basic scientific principles: 1) gravity and 2) the transfer of energy. On Earth, gravity is the force that pulls objects toward the ground. The transfer of energy is what causes objects at rest to move and objects in motion to slow or stop.

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The two most important forms for amusement park rides are kinetic energy and potential energy. In the absence of external forces such as air resistance and friction (two of many), the total amount of an object's energy remains constant.

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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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Basic mathematical subjects such as calculus help determine the height needed to allow the car to get up the next hill, the maximum speed, and the angles of ascent and descent. These calculations also help make sure that the roller coaster is safe. No doubt about it--math keeps you on track.

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A roller coaster does not have an engine to generate energy. The climb up the first hill is accomplished by a lift or cable that pulls the train up. This builds up a supply of potential energy that will be used to go down the hill as the train is pulled by gravity.

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Most roller coasters run by the Law of Inertia. Since an object at rest stays at rest, all roller coasters have to be pushed or pulled to get started.

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The coaster tracks serve to channel this force — they control the way the coaster cars fall. If the tracks slope down, gravity pulls the front of the car toward the ground, so it accelerates. If the tracks tilt up, gravity applies a downward force on the back of the coaster, so it decelerates.

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06 September 22 - 5 Interesting Facts About Roller Coasters
  • The First Roller Coaster was Built in 1817. ...
  • Britain's Oldest Surviving Roller Coaster was Built in 1920. ...
  • There are More Than 2,400 Roller Coasters in the World Today. ...
  • Roller Coaster are Among the Safest Rides. ...
  • Roller Coaster Loops are Never Perfectly Circular.


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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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As it is rapidly transformed into kinetic energy of motion, the forward momentum of inertia cannot be undone. The coaster will roll on indefinitely, or until of course the end of the track, where unbalanced forces like friction between the track and the wheels slow the coaster ultimately to a stop.

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On a roller coaster, energy changes from potential to kinetic energy and back again many times over the course of a ride. Kinetic energy is energy that an object has as a result of its motion. All moving objects possess kinetic energy, which is determined by the mass and speed of the object.

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They have to calculate how big to make the hills, how fast the roller coaster will move at various points on the track, and how long the ride should last. The equation at the very heart of all these calculations is a quadratic equation.

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Programmable logic controllers, usually three of them, monitor every aspect of a coaster's operations. They regulate the ride's speed, ensure that trains never come too close to one another, and alert human operators to technical glitches or track obstructions.

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The electromagnets are installed on the top, or the side of the track. A small gap is left between the two fins allowing for a third fin attached to the train to run in the middle, or either side of the electromagnets. For LIM systems, a current is directed to the pair of fins, therefore creating a magnetic field.

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