Linked from
The 27 pages that link to Rigid body, each with the reason it gives.
TorqueRelated: Torque about an axis is commonly analyzed for bodies treated as rigid.
Static equilibriumRelated: Rigid-body equilibrium accounts for both translation and rotation.
Rotational motionRelated: Rigid-body rotation treats the object's parts as turning together.
Constraint (mechanics)Related: Fixed distances between its points are holonomic constraints.
Rigid motionRelated: Its possible configurations differ by rigid motions.
Kinematic pairRelated: Machine links are commonly modeled as rigid bodies joined by kinematic pairs.