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Homework Statement
A block with mass m1 = 9.4 kg is on an incline with an angle θ = 31.0° with respect to the horizontal.
Now a new block is attached to the first block. The new block is made of a different material and has a coefficient of static friction μ = 0.9. What minimum mass is needed to keep the system from accelerating?
Homework Equations
Ft,1 = Ft,2
Fg,1 = m1*g
Fg,2 = m2*g
Fn,1= Fg,1*cos 31
Fn,2 = Fg,2*cos 31
Ff,s,2 = Fn*.9
The Attempt at a Solution
Ft,1 = Ft,2
Fg,1 = m1*g = 92.12N
Fg,2 = m2*g = m2*9.8
Fn,1= Fg,1*cos 31
Fn,2 = Fg,2*cos 31
Ff,s,2 = Fn*.9
I'm not really sure what to do after this. I have some free-body diagrams set up, but since I can't post them here, I can't show them.
I had a value for the coefficient of static friction, but that was for a system with a spring (.292), so I don't think that'll work here. I also have one for kinetic friction (.212), but that might not apply here. After that, I'm stuck.