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

1. Dec 2, 2008

### AirHendrix

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. Dec 2, 2008

### LowlyPion

Air pressure would have nothing to do with it?

3. Dec 2, 2008

### AirHendrix

^ 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...

4. Dec 2, 2008

### AirHendrix

Sorry to ask but is it air pressure?

5. Dec 3, 2008

### Carid

Why does a sucker-tipped arrow stick to a target?

6. Dec 3, 2008

### minger

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?