  The energy-momentum tensor (EMT) form factors pave new ways for exploring
hadron structure. Especially the D-term related to the EMT form factor D(t) has
received a lot of attention due to its attractive physical interpretation in
terms of mechanical properties. We study the nucleon EMT form factors and the
associated densities in the bag model which we formulate for an arbitrary
number of colors Nc and show that the EMT form factors are consistently
described in this model in the large-Nc limit. The simplicity of the model
allows us to test in a lucid way many theoretical concepts related to EMT form
factors and densities including recently introduced concepts like normal and
tangential forces, or monopole and quadrupole contributions to the angular
momentum distribution. We also study the D-terms of rho-meson, Roper resonance,
other N* states and Delta-resonances. Among the most interesting outcomes is
the lucid demonstration of the deeper connection of EMT conservation,
stability, the virial theorem and the negative sign of the D-term.
