A 40-N Crate Rests on a Rough Horizontal Floor $\mu$ _s = 0

question 68

Multiple Choice

A 40-N crate rests on a rough horizontal floor. A 12-N horizonatl force is then applied to it. If the coefficients of friction are $\mu$ _s = 0.5 and $\mu$ _k = 0.4, the magnitude of the frictional force on the crate is:

• A) 8 N
• B) 12 N
• C) 16 N
• D) 20 N
• E) 40 Nb

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