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Easy statics problem

  1. Nov 8, 2009 #1
    1. The problem statement, all variables and given/known data

    Figure 12-61 is an overhead view of a rigid rod that turns about a vertical axle until the identical rubber stoppers A and B are forced against rigid walls at distances rA = 7.0 cm and rB = 3.2 cm from the axle. Initially the stoppers touch the walls without being compressed. Then force of magnitude 110 N is applied perpendicular to the rod at a distance R = 5.6 cm from the axle. Find the magnitude of the force compressing (a) stopper A and (b) stopper B.

    The distance R is between the axle and stopper A.

    2. Relevant equations

    torque=(radius)*(force)
    torque(net)=0

    3. The attempt at a solution

    For statics I usually pick a pivet point, but since there is an axle will I have to use that as reference?

    using the stopper at rB as the pivet point.
    Fb= force on stopper b
    Fa=force on stopper a
    F=applied force

    Fb*(rB) + F*(rB+R)-Fa*(rA+rB)=0

    F*(rB+R)=Fa*(rA+rB)

    (F*(rB+R))/(rA+rB)=Fa

    Fa-F=Fb

    and it's wrong. [/b]
     
    Last edited: Nov 8, 2009
  2. jcsd
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