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Homework Help: Tension or Compression

  1. Oct 4, 2008 #1
    The figure shows a weight W supported by two light rigid rods P and Q. The rods are smoothly hinged to the wall and mounted in the same vertical plane. Which rod is in compression , is in tension?
     

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  3. Oct 4, 2008 #2

    Doc Al

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    Staff: Mentor

    Show what you've done so far and where you got stuck.
     
  4. Oct 4, 2008 #3
    I can't think anything....
    Actually, compression means the force towards the wall?
    Can you give me some hints to start with the question....
     
  5. Oct 4, 2008 #4

    Doc Al

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    "Compression" means that there's an inward force pushing on the ends of the rod; "tension" means there's an outward force on the rod.

    This is a problem in static equilibrium.
     
  6. Oct 4, 2008 #5
    Can you show me how to solve this question...
    I really can't solve it
    or please give me some hints to guide me to finish it ,thanks...
     
  7. Oct 4, 2008 #6

    tiny-tim

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    Welcome to PF!

    Hi tonald! Welcome to PF! :smile:

    Hint: use good ol' Newton's second law on the peg (or whatever it is) where the two rods meet …

    it isn't moving, and there are three forces on it, so they … ? :smile:
     
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