What forces cause the roller coaster to speed up and slow down *?

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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Rollercoasters use brakes to slow down, or completely stop the train. Rollercoaster brakes can come in the form of magnetic and physical brakes, manual and automatic brakes, brakes that are on the train, and brakes that are on the track.

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Friction is a force that opposes (goes against or opposite to) the motion of an object. If the roller coaster cars are moving to the east, the force of friction is to the west. The force of friction acts on the moving cars, decreasing the total amount of mechanical energy in the roller coaster.

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As you ride a roller coaster, its wheels rub along the rails, creating heat as a result of friction. This friction slows the roller coaster gradually, as does the air that you fly through as you ride the ride.

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When you go around a turn, you feel pushed against the outside of the car. This force is centripetal force and helps keep you in your seat. In the loop-the-loop upside down design, it's inertia that keeps you in your seat. Inertia is the force that presses your body to the outside of the loop as the train spins around.

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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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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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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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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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An early attempt to bring a similar ride to the US in 1848 failed because of an accident during the trial run. It would fall to an American inventor named LaMarcus Thompson to revolutionize the amusement industry in the US, earning him the title of the father of the American roller coaster.

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