Rigid.

A concise introduction to mechanics of rigid bodies Huang, L. 2017 A treatise on the analytical dynamics of particles and rigid bodies Whittaker, E. T. 1927 A treatise on the analytical dynamics of particles and rigid bodies Whittaker, E. T. 1917 Elementary treatise on the dynamics of a particle and of rigid bodies Loney, S. L. 2016 Handbook on Stiffness & Damping in Mechanical Design Rivin, Eugene I. 2010 Mechanics of particles and rigid bodies, by John Prescott Prescott, J. 1929 The elementary part of a treatise on the dynamics of a system of rigid bodies Routh, Edward John 1913