**Unformatted text preview: **. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................................................. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......... F N mg F f F = µ s F N = µ s mg = (0 . 45)(45 kg)(9 . 8 m / s 2 ) = 2 . × 10 2 N . (b) The equation for F is the same but the mass is now 45 kg − 17 kg = 28 kg. Thus F = µ s mg = (0 . 45)(28 kg)(9 . 8 m / s 2 ) = 1 . 2 × 10 2 N ....

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