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In investigating the relation between vorticity and gyroscopic precession, wecalculate the vorticity vector in Godel, Kerr, Lewis, Schwarzschild, Minkowskimetric and find out the vorticity vector of the specific observers is theangular velocity of gyroscopic precession. Furthermore, considering space-timetorsion will flip the vorticity and spin-curvature force to opposite sign. Thisresult is very similar to the behavior of positive and negative helicity ofquantum spin in Stern-Gerlach force. It implies that the inclusion of torsionwill lead to analogous property of quantum spin even in classical treatment.

Vorticity, Gyroscopic precession, and Spin-Curvature Force