In principle, free energy potential energy can only come from the potential energy of motion. In an ideal situation energy is available from a potential difference of a given magnitude between two masses. Therefore it can only come from the total difference in motion between the two masses. The amount of usable energy that can be gathered in this situation will be dependent upon the mass to which the potential energy is attached, which is inversely proportional to the distance between the masses.
In the present situation the energy that can be gathered by friction of the particles in two masses is the sum of the kinetic energies of both masses. In other words, friction means that the total amount of available kinetic energy divided by the number of particles is the energy that can be captured as kinetic energy at any velocity. The mass is the sum of the mass and the velocity of the particles. Thus the energy that can be gathered in this situation is the kinetic energy that is available to the particles that are at rest.
There are two forms of friction. One type of friction is applied only to the particles that are at rest. That is, in that case the particles are at rest in a vertical plane, and friction means that they are accelerated. The other type of friction is applied to the particles in which kinetic energy is obtained, but its application is limited by the amount of motion of the particles that cause the application of force. The application of force through friction also means that kinetic energy must be transferred from the kinetic energy stored in the particles to the kinetic energy produced at some other location, either to other parts of the object, or to some other part of the object.
When one considers the potential energy of space, the amount of energy that is available to act upon the particles at rest is infinite. The same applies to the amount of kinetic energy available to act upon the particles during motion. This means that space is free to act on the particles as a whole on an infinite time scale. That is to say there are always particles that can take on any position on the vertical or horizontal plane at any instant of time. It is the amount of kinetic energy available to move the particles in this manner that results from time and space acting upon the particles in their motion or that causes the motion to be free in some sense.
In the nature of the case, however, friction has a limiting effect when it is applied to the particles that are in motion. A particle that is moving is constantly being compressed by gravity, and gravity tends to reduce the potential of any position that
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