  Current approaches to the problem of inertia attempt to explain the inertial
properties of matter by expressing the inertial mass appearing in Newton's
second law of motion in terms of some other more fundamental interaction. One
increasingly popular approach explains inertial and gravitational forces as
drag forces arising due to quantum vacuum zero-point phenomena. General
relativity, however, suggests that gravitational and inertial forces are
manifestations of space-time geometry. Based on this, the present analysis
demonstrates that inertia and zero-point forces are ultimately relativistic in
origin. Additionally, it is argued that body forces induced on matter through
zero-point interactions are resistive forces acting in addition to inertia.
