Two fields of space are needed to characterize the inertial and gravitational interactions: 1) the temporal-inertial (TI) field that is subject to gravity and is involved in the inertial reaction of matter particles and 2) the static field that is not subject to gravity, but is coupled with the TI field and counteracts the acceleration of particles of the TI field in their response to gravity. When a matter particle or an object composed of matter particles is accelerated by an external force, its motion is resisted by its acceleration relative to the TI field. This reaction force of space is the familiar inertial force. The inertial mass of an object is a measure of the object’s resistance to acceleration. We can say that the inertial mass couples the acceleration of the object to its reaction force. The feedback model of the inertial interaction exposes the existence of not one but two coupling factors that affect this interaction. In the inertial interaction, an object responds to the net force on the object, a net force that is the difference between the applied force and the reaction force. The net force is very much smaller than either the applied force or the reaction force. The second coupling factor, that I’ll call the K factor, couples this net force to the acceleration of the object. Gravity works in an analogous manner. The flux of gravitons on particles of the TI field provides a force that accelerates these particles relative to the static field and the gravitational body. Coupling between the TI and static fields resists this acceleration. The acceleration of particles of the TI field in response to gravity is thus the acceleration of gravity. Matter particles within the TI field are accelerated at the same rate as those of the TI field toward the gravitational body. Thus the gravitational force is transmitted through the intermediary of the TI field to massive particles and objects comprising massive particles.