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Previous: Rolling Friction
When the track is curved upward, the load wheels will roll smoothly, but the guide wheels will
be sliding somewhat, in addition to rolling. This is caused by the curvature in the track.
Similarly, when the coaster is navigating a flat turn, the guide wheels will roll smoothly, but the
load wheels may slide. This sliding friction can be modeled as Coulomb friction, and varies
linearly with the force exerted on the sliding wheel normal to the direction of the sliding. This
force should only be considered for the wheels which are sliding.