When a question asks how much force is needed to get an object moving is the answer "at least the value of the static force" or would it be greater than the static force? I thought it would be the latter, but some example problems seem to indicate otherwise. I thought if the force exerted equaled the maximum static there would no net force so there would be no movement. An example of this is 2.12a in the Berk Review physics book. Their answer choice is at least 12 for a 15lb pack with coefficient for static friction being .8. I would've thought it would be some value greater than 12. Thanks.