The Collaborative International Dictionary of English v.0.48:

kinetics \ki*net"ics\ (k[i^]*n[e^]t"[i^]ks or
   k[-i]*n[e^]t"[i^]ks), n. (Physics)
   See Dynamics.
   [1913 Webster]

WordNet (r) 3.0 (2006):

kinetics
    n 1: the branch of mechanics concerned with the forces that
         cause motions of bodies [syn: dynamics, kinetics]