Rigid-body dynamics is the study of the movements of a collection of connected bodies subject to external forces in the absence of deformation. The assumption of a rigid body (no deformation) allows the dynamics to be described by translations and rotations, with the Euler angles often playing an important role in the analysis.

Typically, questions about rigid-body dynamics involve either a single solid object rotating about an arbitrary axis or a set of solid objects moving due to an external force.

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