A worker pulls a 200-N packing crate at constant velocityacross a rough floor by

Question

A worker pulls a 200-N packing crate at constant velocityacross a rough floor by exerting a force F=55.0N at an angle of35.0 degrees above the horizontal. What is the coefficeint ofkinetic friction on the floor? a) 0.133 b) 0.267 c) 0.400 d) 0.200 e) none A worker pulls a 200-N packing crate at constant velocityacross a rough floor by exerting a force F=55.0N at an angle of35.0 degrees above the horizontal. What is the coefficeint ofkinetic friction on the floor? a) 0.133 b) 0.267 c) 0.400 d) 0.200 e) none

Explanation / Answer

w = 200 N, F = 55.0 N, = 35.0o, find constant velocity, so a = 0, friction force = f horizonatl net force = Fcos - f = 0, so f = Fcos vertical net force = N + Fsin - w = 0. so N = w -Fsin = f/N = Fcos/(w - Fsin) = 0.267

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