  In this paper we propose a simplified model to describe the dissipative
effects of tides. We assume a spherical Earth with a dissipative coupling with
a mechanical dumbbell. The latter has a mass much smaller than the Earth's, and
it models the presence of the tidal bulges. Using properly the scale analysis,
we will show that some of the consequences of tidal dissipation are the
circularization and the enlargement of orbit of the Moon and the slowing down
of the Earth's rotation. We will also see that tidal dissipation plays a
fundamental role for the establishment of a regime of spin-orbit resonance in
the celestial systems. The mathematical tools used make our treatment
appropriate for senior high school students or college students.
