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Gravity, kinetic energy and momentum are what propel roller coasters across the tracks.
As gravity pulls roller coasters down hill, kinetic energy and momentum builds. Both the energy and momentum gained then propel the rollercoaster back up hills and through loops..

Roller coaster - Wikipedia

en.wikipedia.org/wiki/Roller_coaster

A roller coaster is an amusement ride developed for amusement parks and modern theme ... The track does not necessarily have to be a complete circuit, as shuttle roller coasters demonstrate. ... Usi...

How Do Roller Coasters Work? | Wonderopolis

wonderopolis.org/wonder/how-do-roller-coasters-work

Potential energy represents the amount of work the roller coaster will be able to do with the energy it builds up from falling down the other side of the hill.

How Roller Coasters Work | HowStuffWorks

science.howstuffworks.com/engineering/structural/roller-coaster.htm

Roller coasters are thrilling rides and fascinating studies in physics. Learn about the history, physics ... Up Next. How does gravity work? What makes you dizzy ...

Loop-the-Loops - How Roller Coasters Work | HowStuffWorks

science.howstuffworks.com/engineering/structural/roller-coaster7.htm

Loop-the-Loops - Roller coaster loops, or loop-the-loop, create exciting thrill rides . Learn how roller coaster loops work and about different types of loop-the-loops. ... Structural Engineering Marvels · How do you build an underwater tunnel?

How rollercoasters work | Science of rollercoasters - Explain that Stuff

www.explainthatstuff.com/rollercoasters.html

Dec 14, 2016 ... But they do need energy of some sort. Before a rollercoaster ride begins, an electric winch winds the cars to the top of the first hill. That can take ...

Amusement Park Physics -- Roller Coaster - Annenberg Learner

www.learner.org/exhibits/parkphysics/coaster.html

How does a roller coaster work? What you may not realize as you're cruising down the track at 60 miles an hour is that the coaster has no engine. The car is ...

www.ask.com/youtube?q=How Do Roller Coasters Work?&v=7Tredv0Yq1M
Apr 16, 2009 ... How roller coasters work. ... How do they do it ? ... How To Build An Epic Roller Coaster In Roller Coaster Tycoon - Duration: 7:37.

Roller Coaster | Physics | Amusement Park | Work | Science Fair ...

www.kidzworld.com/article/4633-how-roller-coasters-work

It's the amount of work an object will be able to do with the energy it builds up from falling. The energy the roller coaster builds up from falling down that first hill  ...

Rollercoaster | Engineering & Construction Videos | Discovery Science

www.sciencechannel.com/video-topics/engineering-construction/machines-rollercoaster/

Millions of people across the world ride rollercoasters to get the thrill of their lives! Find out what takes to make some of the fastest rollercoasters work.