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Homework Help: Why does a piece of glass stick to another piece of glass?

  1. Dec 2, 2008 #1
    1. The problem statement, all variables and given/known data
    What does a piece of glass stick to another piece of glass? We conducted a demo in school where we stuck to pieces of identical see-through glass on top of each other and they stuck together for a second or two.

    2. Relevant equations
    None whatsoever other than it was about "Over Polished" Substances

    3. The attempt at a solution
    It sticks due to their friction
  2. jcsd
  3. Dec 2, 2008 #2


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    Homework Helper

    Air pressure would have nothing to do with it?
  4. Dec 2, 2008 #3
    ^ I'm sorry.... Its just that its been two weeks since that lecture and he told us just to watch it... It was a lab demo of Over Polished substances...
  5. Dec 2, 2008 #4
    Sorry to ask but is it air pressure?
  6. Dec 3, 2008 #5
    Why does a sucker-tipped arrow stick to a target?
  7. Dec 3, 2008 #6


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    Science Advisor

    Draw a free-body diagram and indicate where atmospheric pressure exerts forces. How much "atmosphere" exists between two pieces of identical highly-polished pieces of glass?
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