- #1
fizzex
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Homework Statement
(a) suppose the coefficient of μκ between m1 and the plane in Fig 4-57 is 0.15, and that m1=m2=2.7 kg. As m2 moves down, determine the magnitude of the acceleration of m1 and m2, given θ = 25°. (b) What smallest value of kinetic friction will keep this system from accelerating?
Homework Equations
There are many equations...
For part A, ƩF = Fg - Ft +Fn
Fg = mg
ƩF = Fg - Ft
Ff = μ(Fn)
Part B, I'm not too sure.
I was going to have Ft - Fg - Ff = ƩF, and have ƩF=0 because ƩF = ma, and acceleration would be 0, but then I was confused.
The Attempt at a Solution
I solved Part A... the acceleration is 2.16. If you want me to go through the whole process, I will, just for the sake of time, I was hoping to just start from part B, where I'm absolutely stuck. I know that I have to set acceleration equal to zero, but when I tried I got 0.14 instead of the answer, 0.64.
Any suggestions? ...and does that even make sense? Sorry, it's my first post.