Question: In high school physics, W=mg shows that 1 slug weighs 32.174 pounds. Yet 1 slug 1 pound s2/A. Similarly, 1 kg weighs 9.8 N. What does 1 kg equal? Note the difference between "weighs" and "equals" that we often lose sight of during homework assignments and exams. Note too that the working slug-ft-sec system is identical to the mks units. It is the lbm-ft-sec system that is unusual.