coefficients of friction?

Question

If the coefficient of kinetic friction between a 32 kg crate and the floor is 0.35, what horizontal force is required to move the crate at a steady speed across the floor?
____N
What horizontal force is required if µk is zero?
____N

Answer 1

Constant speed means acceleration = 0
the frictional force is
F=32*9.8*0.35
F=110 N
if µk=0
F=0

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