Rollar+Coaster

[|www.learner.org/interactives/parkphysics/coaster.html]

The car is pulled to the top of the first hill at the beginning of the ride, but after that the coaster must complete the ride on its own.

The conversion of potential energy to kinetic energy is what drives the roller coaster, and all of the kinetic energy you need for the ride is present once the coaster descends the first hill.

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.