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relation involves meaning. There will be two lines of inquiry.
First, all physical forces appear to subsist between pairs of
particles. This was assumed by Helmholtz in his original paper on the Conservation of Forces.
Take any fact in physics of the triadic kind, by
which I mean a fact which can only be defined by
simultaneous reference to three things, and you will find
there is ample evidence that it never was produced by the
action of forces on mere dyadic conditions. Thus, your right
hand is that hand which is toward the east, when you face
the north with your head toward the zenith. Three things,
east, west, and up are required to define the difference
between right and left. Consequently chemists find
that those substances which rotate the plane of polarization
to the right or left can only be produced from such
active substances. They are all of such complex constitution
that they cannot have existed when the