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

A student pulled a box of books weighing 68kg by a rope at an angle of 58 degrees above the horizontal plane of the floor. The floor has a coefficient of kinetic friction of µk=.27. What is the acceleration of the box of books?

2. Relevant equations

∑F = ma

Force of friction = µk * Normal force

3. The attempt at a solution

I chose the direction the box of books was being pulled to be positive. Then I summed up all the forces in the x direction and applied Newton's Law F=ma and solved for a.

∑Fx = Force from rope in the x direction - Force of friction = ma

∑Fx = 68*cos(58) - .27*(68 * 9.81) = (68)a

solve for a.

This problem was on my final yesterday so the numbers arent correct but is my reasoning and approach to this problem right? I thought i knew how to do these types of problems but the answer i was getting wasnt a choice on the test.

Thanks in advance.

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# Homework Help: Problem on my Final. pulling box with rope problem

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