  We investigate the quark angular momentum in a model with the nucleon being a
quark and a spectator. Both scalar and axial-vector spectators are included. We
perform the calculations in the light-cone formalism where the parton concept
is well defined. We calculate the quark helicity and canonical orbital angular
momentum. Then we calculate the gravitational form factors which are often
related to the kinetic angular momentums, and find that even in a no gauge
field model we cannot identify the canonical angular momentums with half the
sum of gravitational form factors. In addition, we examine the model relation
between the orbital angular momentum and pretzelosity, and find it is violated
in the axial-vector case.
