(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A 3-lb horizontal force is applied to a 10-lb block on a rough horizontal surface. The block is initially at rest. If [itex]\mu[/itex]_{s}is 0.5 and the [itex]\mu[/itex]_{k}is 0.4, the frictional force on the block is?

2. Relevant equations

F_{N}=mg

F_{k}=[itex]\mu[/itex]_{k}F_{N}

F_{s,max}=[itex]\mu[/itex]_{s}F_{N}

3. The attempt at a solution

I found [itex]\mu[/itex]_{s,max}required to move the 10-lb block was 49.0 lb/ms^2..or approximately 22N.

Since the force being applied is 3-lb, or approximately 1.4N, then the frictional force must be equal to the force being applied correct?

Thanks.

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# Homework Help: Conceptual Friction Question

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