What is "force"? - Something out of balance attempting to re-establish that balance in a syntropic (gravity) manner. All is vibration (unbalanced forces rhythmically interchanging between polar states). For instance, gravity and radiation are opposing sides of the same coin of dynamic interexchanging polarity. Gravity and electricity are the same category of force but on different levels or dimensions - gravity being the higher form. Dispersion and magnetism are of the same category of radiating or dispersing energy.
"Life in its manifestations is vibration. Electricity is vibration. But vibration that is creative is one thing. Vibration that is destructive is another. Yet they may be from the same source. As in the electrical forces in the form or nature prepared even for use in the body."
Q - "What is my ray?"
A - "Depends on what you are thinking. Remember life is vibration. So is mind. So is matter. As to the ray, this changes. Don't think you sit on a ray and it carries you along. You make the ray." Cayce (1861-16)
How can "non-physical" effect physical? Is electricity non-physical? Is light? Is Mind or consciousness thought? What is Mind made of? All three are usually taken as non-physical yet they all have effects on physical matter. What is force? What is energy? What is matter? Are not they all the same dynamical construct but in different form? Yes, they are all different forms of matter. We know that now but in 1893 Keely's pioneer work preceded all atomic and nuclear energy research by decades. See Etheric Elements