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

A construction worker passes a brick to another worker by pushing it across a wooded floor. the brick has a mas of 2.7kg. The force required making the brick move with acceleration of 0.42m/s^{2}is 28 N. What is the co-efficient of kinetic friction acting on the brick?

3. The attempt at a solution

FN=Fg

= mass X acceleration

=2.7kg X 0.42m/s^{2}

=1.134 N

F_{kf}= μ_{k}X FN

μ_{k}= F_{kf}[itex]/[/itex] FN

= 28N [itex]/[/itex] 1.134N

=24.69

I'm pretty sure I got the acceleration part wrong. What am I supposed to do to find the normal force?

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# Finding the coefficient of kinetic friction

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