An outline of the remainder of this work is as follows. Section 2 considers hoe one might establish F=ma is a physical law, and Sec. 3 considers hoe one might establish the physical law that weight and mass are proportional. Section 4 shows how one can use these laws, if accurate enough compared to the primary measurements of force, length , and time , to replace the least accurately known of these primary measurements. Finally , Sec. 5 provides a brief summary