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We show that in slowly generated 2d packings of frictional spheres, asignificant fraction of the friction forces lies at the Coulomb threshold - forsmall pressure p and friction coefficient mu, about half of the contacts.Interpreting these contacts as constrained leads to a generalized concept ofisostaticity, which relates the maximal fraction of fully mobilized contactsand contact number. For p->0, our frictional packings approximately satisfythis relation over the full range of mu. This is in agreement with a previousconjecture that gently built packings should be marginal solids at jamming. Inaddition, the contact numbers and packing densities scale with both p and mu.Comment: 4 pages, 4 figures, submitte

Force mobilization and generalized isostaticity in jammed packings of frictional grains