The context of sport offers much opportunity to evidence how physics construct model analyzing complex
and not controlled phenomena as in each sports situations and actions. A proposal on physics in the
context of Judo was designed, centered on the video analysis and modeling of judo throw techniques. The
approach follows this schema: the motion of the athlete that is thrown on the tatami is analyzed, measuring
from video the kinematical quantities describing the motion; simple rigid body models was constructed that
can give count of the observed motion. Three main aspects are analyzed: the force couple acting on Uke,
the opponent who undergoes the technique; the centers of mass relative positions of the two contestants
and in particular the trajectory of Uke; the energy exchange condition during a judo action that offers an
interesting example of resonant coupling
