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Static friction f_s satisfies:

Af_s ≤ μ_s N
Bf_s = μ_s N
Cf_s = μ_k N
Df_s ≥ μ_s N
Answer & Solution
Correct answer: A. f_s ≤ μ_s N
Static friction is SELF-ADJUSTING. It can be anything from 0 to a maximum μ_s N. The LIMITING friction f_max = μ_s N is the maximum before sliding starts.
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