mechanics the branch of physics concerned with the motion of bodies in a frame of reference
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Wiktionary
Substantiv
kinetics -
The branch of mechanics concerned purely with the motion of bodies. This is in contrast to dynamics, which also considers the reasons for motion, e. g. the forces acting on such bodies.
kinetics The branch of classical mechanics that is concerned with the relationship between the motion of bodies and its causes, namely forces and torques (source: Wikipedia).