 To begin with, Hume does not consider Newton’s “Axioms or Laws of Motion” as a priori in any sense (in Kant’s terminology, neither analytic nor synthetic a priori). All of these laws, according to Hume, are simply “facts” inductively derived from (constant and regular) experience. Hume considers Newton’s second law of motion (F = ma) in the Enquiry, section 4, part 1 (EHU 4.13; SBN 31): 