Kant on Extension and Force: Critical Appropriations of Leibniz and Newton

Abstract

This paper describes Kant’s complex position on extension, showing how it emerges from the various ways in which he reacts to the views of Descartes, Locke, Newton, and Leibniz. Specifically, the paper argues that Kant’s views are closer to Leibniz’s than they are to those of Descartes, Locke, and Newton, insofar as Kant and Leibniz both reject the view that extension is a fundamental property, holding instead that it is explicable (at least in part) on the basis of more fundamental forces. Kant disagrees with Leibniz, however, insofar as he rejects Leibniz’s distinctive commitments to certain metaphysical doctrines (such as pre-established harmony) and to active and passive primitive and derivative forces, opting, instead, for a Newtonian inspired conception of attractive and repulsive forces. In this way, the Critical Kant develops a hybrid position that attempts to make good use of aspects of both Leibniz’s and Newton’s accounts as he articulates his own distinctive position.