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J0hnnyD
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Homework Statement
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?
Homework Equations
∑F = ma
Force of friction = µk * Normal force
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.