How does a roller coaster move without an engine?

Rollercoaster trains have no engine or no power source of their own. Instead, they rely on a supply of potential energy that is converted to kinetic energy. Traditionally, a rollercoaster relies on gravitational potential energy – the energy it possesses due to its height.



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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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Running wheels guide the coaster on the track. Friction wheels control lateral motion (movement to either side of the track). A final set of wheels keeps the coaster on the track even if it's inverted. Compressed air brakes stop the car as the ride ends.

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The force of forward momentum slowly depreciates throughout the ride. At the end of the ride friction between the wheels and the track or wheels and their brakes slowly wins out and the cars come to a halt. The harder the brakes are applied the more rapidly the coaster will come to a stop, also known as deceleration.

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A roller coaster ride comes to an end. Magnets on the train induce eddy currents in the braking fins, giving a smooth rise in braking force as the remaining kinetic energy is absorbed by the brakes and converted to thermal energy.

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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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These giant marvels of machinery are experiential monumental sculptures designed to produce human sensations that only a coaster can produce. And unfortunately, coasters don't garner the kind of respect and appreciation that I think they deserve. There are over 2,400 rollercoasters in the world.

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Inertia is the force that presses your body to the outside of the loop as the train spins around. Although gravity is pulling you toward the earth, at the very top the acceleration force is stronger than gravity and is pulling upwards, thus counteracting gravity.

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According to Kevin Hickerson, a physicist at the California Institute of Technology, “All the energy a roller coaster gets comes from the initial point it's cranked up to, and from there it just gains more and more kinetic energy.” The height of this first drop also determines the speed of the coaster cars.

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Vanish Roller Coaster is a one-of-a-kind roller coaster at Cosmo World Amusement Park in Yokohama, Japan. It actually brings riders underwater.

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Believe it or not, strong magnets are used in roller coasters to create an unexpected acceleration at the beginning of the ride. This occurs through the process of electromagnetic propulsion, which is where electrical impulses force magnets between the track and bottom of the train to repel instead of attracting.

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How safe are rides? According to IAAPA, there are 0.9 injuries per million rides and that in a typical year, more than 385 million guests take more than 1.7 billion rides at about 400 North American fixed-site facilities.

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Record holder Kingda Ka, the tallest coaster in the world at 456 feet (139 m), has held onto its record since 2005.

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Cobra Roll – Term used to describe a double inversion which can be found on some roller coasters designed by Bolliger and Mabillard. The design of the element looks similar to the hood of a striking cobra. Corkscrew – A twisting inversion, designed similar to a corkscrew. Not too dissimilar to a barrel roll.

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