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Difference between Centroid and Centre of Pressue

  1. Sep 28, 2015 #1

    Yam

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    1. The problem statement, all variables and given/known data
    What is the difference between the Centre of Pressure and Centroid

    2. Relevant equations


    3. The attempt at a solution
    My understanding is that the centre of pressure acts on a centroid. So, how come they can be on different positions for a submerged surface?
     
  2. jcsd
  3. Sep 28, 2015 #2

    RUber

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    If pressure is applied evenly to a flat surface, then the center of pressure is the centroid. If a submerged surface is at an angle, then the pressure is not constant across the surface.
     
  4. Sep 29, 2015 #3

    SteamKing

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    Even if the submerged surface is perfectly vertical, the centroid and the c.p. don't coincide because of the pressure gradient due to Pascal's Law where P = ρgh.
     
  5. Sep 30, 2015 #4

    haruspex

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    Likely RUber meant at an angle to the horizontal, which would include 90 degrees.
     
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