The frictional force, for the given conditions, is the product of the weight and the friction coefficient= W*μ = 26.10*0.332 = 8.665 kg force, or, if to use Newtons as the unit of the weight, = mg*μ = 26.10*9.81*0.332 = 85 newtons.
Just about 60 years, kilograms are not used as a force measure, been replaced by Newtons.