Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 213
196 MECHANICS. lib. … The resultant effects of forces, as heretofore treated,16 lbs. have been without motion, or static. But when motionis produced, the forces are called dynamic. A weight sus-pended or supported exerts a force, which is balanced bythe resistance of the suspending or supporting medium;but a falling…
Mechanical drawing
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