physics

A 4.00 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0° with the horizontal, as in the figure below. The block accelerates to the right at 6.00 m/s2. Determine the coefficient of kinetic friction between block and ceiling.

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  1. y direction:
    85sin55 = mg + Fn (note normal is DOWN in this case) Find Fn
    x direction:
    85cos55-Ff = ma Find Ff
    mu = Ff/Fn

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