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Static Equilibrium of Board

  1. Apr 11, 2016 #1
    1. The problem statement, all variables and given/known data
    There is a diving board held up by two pillars A and B, and there is a diver standing on it's edge. What are the directions of the forces exerted at points A and B? Picture Below:
    okpdG11.png
    2. Relevant equations
    F_NET = 0
    T_NET =0

    3. The attempt at a solution
    I thought both A and B were pointed upwards since the diver is pushing downwards, but apparently B is upwards and A is downwards.
     
  2. jcsd
  3. Apr 11, 2016 #2

    berkeman

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    Staff: Mentor

    Welcome to the PF.

    Think of a see-saw with the point B being the fulcrum. What do you see now?
     
  4. Apr 11, 2016 #3
    Oh, wow! I see point B as pointing up now, but what about point A? If I use A as the fulcrum, doesn't that still make it point upwards in order to keep the board from rotating downwards?
     
  5. Apr 11, 2016 #4

    berkeman

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    B is the fulcrum. Did you never use a see-saw? :smile:
     
  6. Apr 11, 2016 #5
    Ok, I'm still confused. Sorry. If B is the fulcrum and it's force is going upwards, I'm still not understanding how A's force is going downwards. Given the see-saw example, the diver is on one end pulling down on the end of the see-saw, and A is somehow pulling downwards even though it's on the bottom? I really appreciate the help!
     
  7. Apr 11, 2016 #6

    berkeman

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    What if the person sitting on the right side of the see-saw is heavier than the person sitting on the left side? What happens to the left side of the see-saw? :smile:
     
  8. Apr 11, 2016 #7
    It goes upwards, but I don't know what happens at point A because A is on the underside of the diving board.
     
  9. Apr 12, 2016 #8

    haruspex

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    Imagine taking pillar A away. Which way would the part of the board above A move?
     
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