  The paper presents results of investigations of small bodies dynamics in a
vicinity of giant planets. We used the most simple body model: gravitationally
bounded, rotating contact binary affected by the tidal force acting from a
planet. Spin variations of such binaries were extensively studied during
planetary close encounters. Two main types of dynamical behaviour were
observed: (i) huge but interim fluctuations of the angular velocity and (ii)
permanent changes of a rotation during a close approach. The first type is
observed mainly for fast rotators, while the second one was encountered in a
population of slowly spinning objects with periods longer than 12 hours.
Conclusions on usability of such crude physical body models in dynamical
investigations and a comparison to previous results were attached. The results
allow us to formulate a thesis explaining the phenomenon of creation of the
extremely slow rotators and an observational excess of such type of objects.
