The science of mechanics; a critical and historical account of its development (1902)
Mach, Ernst, 1838-1916, McCormick, Thomas Joseph, 1865- tr · Chicago, The Open court publishing company; · leaf 426
rk. Hence, every component force in adirection tangential to thesurface is = 0 ; and the di-rection of the resultantforceis everywhere normalto the surface. If we call dnthe element of the normalintercepted between twoconsecutive surfaces, andythe force requisite to con-vey unit mass from theone… … 400 THE SCIENCE OF MECHANICS. ered. If, therefore, the surfaces U are known, thedirections of the forces are given by the elements of asystem of curves everywhere at right angles to thesesurfaces, and the inverse distances between the sur-faces measure the magnitude of the forces. * These sur-faces…
Mechanics
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