Physics and Metaphysics

Kant seems to conceive 'physical' as synonymous with 'material'.  If so, then Attraction and Repulsion are 'physical' forces.  Now, as has been previously argued here, the perception of matter presupposes the exercise of a repulsive force by the perceiver.  Thus, insofar as his foundations of natural science entail perceptual activity, how they are 'metaphysical' is problematic, at best.