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Direction of tension

  1. Oct 15, 2015 #1
    1. The problem statement, all variables and given/known data
    why i figure b , the direction of FBD is in downward direction , whereas in a , its in upward directon

    2. Relevant equations

    3. The attempt at a solution

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  3. Oct 15, 2015 #2


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    Because in the two figures, you are looking at the opposite ends of the wire.
  4. Oct 15, 2015 #3
    can you expalin further ?
  5. Oct 15, 2015 #4


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    Sure. Suppose we are each holding one end of a wire, and pulling as hard as we can. I am pulling to the left, say, and you to the right. So the wire is pulling me one way at my end. And the other end of the same wire is pulling you the exact opposite way at the other end.
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