We always have enough force to start budging it but right when we budged it we overcome the static friction for just a moment our acceleration was slower because we're overcoming that static friction but once we budged it and once it's moving and assuming that we're continuing to apply a constant force over here then all of a sudden, the force of friction since we're kind of bump it along the top now and not stuck in their grooves we're now using the coefficient of kinetic friction