1. The problem statement, all variables and given/known data I know that static friction is normally almost always more than kinetic friction. But I do not know how to prove that. I have to find formulas to find static and kinetic friction, but when the object is at rest or constant velocity, F-µ(Fn)=0. It is the same equation for both, then, because the object is only at rest or in constant velocity. I cannot get a different µ, then. 2. Relevant equations F=µ(Fn)=0 F=(µg)m m=µg µ=m/g For both static and kinetic 3. The attempt at a solution I am not sure what to do if µ=m/g, because the mass will always be the same, even if the object is at constant velocity or not, and so will the gravity. So how come the kinetic friction is supposed to be less than the static friction?