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Equilibrium Problem

  1. Jun 9, 2010 #1
    1. The problem statement, all variables and given/known data
    Please see attachment.


    2. Relevant equations

    Summation F(x)=0

    Summation F(y)=0

    Summation tau=0

    3. The attempt at a solution
    Please see attachment.

    I know how to calculate the problem but I don't know the last part of the solution why the examinar choose mu(min)=1. Please help me.Thank you.
     

    Attached Files:

  2. jcsd
  3. Jun 10, 2010 #2

    kuruman

    User Avatar
    Homework Helper
    Gold Member

    You have already seen that the force of friction is the same 4N at all points. That's what's required to keep the system at equilibrium. Imagine starting with a large μ and reducing it gradually. Slipping will occur at the point where the maximum value that static friction can have (=μ R) goes just below the value 4 N first. So if you write

    μR = 4 N,

    at which of the three points A, B and C μR falls below 4 N first as you make μ smaller?
     
  4. Jun 12, 2010 #3
    Thank you very much for explaination.Firstly I don't understand so I read many times your concept. Now I understand. I really appreciate you. Sorry for replying late.
     
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