Question

3- To unload a bound stack of plywood from a truck, the driver first tilts the bed of the truck and then accelerates from rest. The coefficients of friction between the bottom sheet of plywood and the bed are μs = 0.40 and = 0.30 and θ = 19"Determine the smallest acceleration of the truck which will cause the stack of plywood to slide. 211

Answer 1

FN arcos θ ат sin θ mg sinθ ng cos6 mg Use Newton's second law perpendicular to the plane Fe-mg cos θ _ ma, sin θ The minimum force required is maximum static friction force Use Newton's second law parallel to the plane f-mg sine-mA+ cos θ _ g(x, cos θ-sin θ) t, sin θ + cos θ 9.81 m/s')(0.4)cos(19°)-sin(19)) 9.81 m/s2 ((0.4)cos (19°) - sin (19° (0.4)sin (19°)+cos(190) 0.48 m/s

Answer 2

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