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## Homework Statement

A sled is pulled at a constant speed over a horizontal surface where the kinetic coefficient of friction is .20. What is the minimum force necessary to keep the sled moving if its mass is 2 slugs?

## Homework Equations

f(s)=U(s)N or f(s)=Ns(mg)

F(s)= Frictional Force

m=weight

g=gravity

(Not sure about this equation or problem)

## The Attempt at a Solution

F(s) = Ns(mg)

F(s) = (.20)(2 slugs)(32 ft/s^(2))

F(s) = 12.8 N ???

Am I doing this right or wrong? Can somebody please show me how to do this?