Editing Rotation (section)

== Amusement rides ==
Many [[amusement ride]]s provide rotation. A [[Ferris wheel]] has a horizontal central axis, and parallel axes for each gondola, where the rotation is opposite, by gravity or mechanically. As a result, at any time the orientation of the gondola is upright (not rotated), just translated. The tip of the translation vector describes a circle. A [[carousel]] provides rotation about a vertical axis. Many rides provide a combination of rotations about several axes. In [[Chair-O-Planes]] the rotation about the vertical axis is provided mechanically, while the rotation about the horizontal axis is due to the [[centripetal force]]. In [[roller coaster inversion]]s the rotation about the horizontal axis is one or more full cycles, where inertia keeps people in their seats.