The observed reduction in acceleration of a mass at higher velocities
compared with that at lower velocities, for apparently the same applie
d (driving) force, in not due to increase in inertia with velocity, as
relativity theory suggests. It is due to a reduction in effective for
ce with velocity. The force balance (Newton's third law) is secured by
the inertia of the energy left in the intermediate region. Mass remai
ns an invariant, as does the ratio of force to the time derivative of
the momentum (Newton's second law). It is only necessary to use the co
rrect proper times for each part of the interacting systems, as well a
s the hereto belonging proper velocity numbers. Proper times result fr
om the actual physical nature of time dilatation (clock retardation).
Forces, velocities, and time are interlinked physical quantities and w
ill attain special unique numerical values only in the frame that is a
t absolute rest, the Mach frame. Inertia appears linked to magnetic mi
crofields between the moving charges that always accompany matter. Suc
h microfields can be considered analogous to those representing chemic
al binding energy. Symmetry requirements will then determine the strai
ght path of inertial movement, and when violated, cause the centrifuga
l effects. Practical equations do not change because of the new nonrel
ativistic interpretation of the interactions, but certain paradoxes of
the presently reigning theories are resolved.