Electric quanta ("electricons") hopping along electrons dissipate part of their energy in "energizing" the electrons they hop to and from. This "excitation" is of a "peculiar" kind: it acts on the electrons' spin, uniforming their orientation, as it occurs naturally in magnets. This allows for the generation of a magnetic field. This field is not "just there", i.e., static, but is being constantly renewed by the speeding electrons' spin. The kinetic energy of the spin is thus manifested as the force called magnetic field. This force, in turn, can revert to electricons when acting on loose electrons of a metal being moved by kinetic energy in a way that cuts accross the magnetic field. Over an extremely long period of time, the spin energy of natural magnets will be spent, leading to the loss of its properties.
The overall process can be depicted in the following way: The spin's energy of the primal Physical Vibrations (PV) generated a gravity field, i.e., a gravity force. Eventually, this force centripetally attracted the initially created protium forming the molecular hydrogen clouds. The pressure and the resulting frictionally generated heat, started the fusion process of star formation. Not all the energy went into the formation of matter; the excess energy remained free to act, attached to molecules, viz., to matter. The characteristics of that energy depend on the way it attaches. When loosely attached to metal electrons, and hopping along them, it is electric energy, part of which is manifested as a magnetic field, a constantly renewed force. The process may be described as: Energy (partially) --> force (potential energy) --> energy --> ...

Not all forces are manifested as fields. A static object under the attraction of a gravitational body such as Earth, has potential kinetic energy, which is a force that can be completely manifested as the object travels until it stops at the limit set by the "forbidden" gravity center of the attracting gravitational body. As the object is risen (moved away) from Earth, its weight decreases, while its force increases, because force is basically dependent on the object's mass and the maximal velocity it can attain under optimal conditions. In practical, down-to-earth physics, force is determined by mass and the velocity that can be attained when moving unimpeded toward the attracting gravity body's surface. Once moving, the force is effected as kinetic energy, which is equivalent to the energy invested in rising the object from ground.

Even at gravity zero that force is present in the object, because at a given distance, inertial velocity takes over without further investment of energy. If the terrestrial object then "falls" to Moon's center, it will retain the force equivalent to the mass difference between Earth and Moon.

In theoretical physics, even when "falling" to Earth's center, the object retains the force that would be completely transformed into kinetic energy in its travel until reaching the permissible center of an imaginary sphere containing all the mass of the universe.