- #1
Northbysouth
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Homework Statement
The uniform 22-kg bar is supported on the horizontal surface at A by a small roller of negligible mass. If the coefficient of kinetic friction between end B and the vertical surface is 0.19, calculate the initial acceleration of end A as the bar is released from rest in the position shown. The acceleration is positive if to the left, negative if to the right.
I have attached an image of the question
Homework Equations
The Attempt at a Solution
I summed the forces in the x and y directions
ƩFx = max = -NB
ƩFy = may = NA - mg - F
F = ukN
ƩFy = may= NA - mg + ukNB
So, I have 4 unknowns: ax, NB, NA and ay
and two equations. How do I find the other two equations needed to solve this problem?
I considered taking the moment about B, but this then adds in two more unknowns: α and aG. I suspect that I may need to use relative accelerations equations, but is there another way?