Question: 1. Given Fapp = 55N mass = 4 kg u = 0.85 Solution Fgrav = mass * gravity Fgrav = 4kg * 9.8 m/s2 Fgrav

1. Given Fapp = 55N mass = 4 kg u = 0.85 Solution Fgrav = mass * gravity Fgrav = 4kg * 9.8 m/s2 Fgrav = 39.2 N Fnorm = Fgrav - Fapp sin Fnorm = 39.2 - (55sin38) Fnorm = 39.2 - 33.86 Fnorm = 5.34 N Ffrict = Fnorm * u Ffrict = 5.34 N * 0.85 Ffrict = 4.54 N Fnet = Fapp cos - Ffrict Fnet = 55cos38 - 4.54 Fnet = 43.34 - 4.54 Fnet = 38.8 N a = Fnet / mass a = 38.8 N / 4kg a = 9.7 m/s2 use this

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