Abstract
The two-dimensional inverse problem of dynamics is considered for nonconservative force fields, both in inertial and rotating frames. The families of curves are given in parametric form x = F(λ, b), y = G(λ, b), b varying along the monoparametric family of planar curves and λ being the parameter describing a specific curve. The special case of the force fields generated by a potential in an inertial field, already studied by Bozis and Borghero, is derived as well as the corresponding one in rotating frames.