In discussing the flight trainer we obtained a description of the motion of a rigid body in terms of the external forces acting on it. In general, however, bodies are not so rigid that relative motion between the parts can be completely neglected. In many cases the general shape of the body is still retained, so that it seems desirable to distinguish a gross motion for the body as a whole and a relative motion for the parts. The distinction we will make between the two motions does have certain arbitrary aspects, but these are consequent on practical exigencies.
KeywordsOrthogonal Matrix Reference Position Orthogonal Matrice Small Cube Reference Situation
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