Timeline for why making a surface "super" smooth increases the coefficient of friction?
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 20, 2011 at 15:06 | comment | added | Martin Beckett | @Tom - it's also a problem with high precision optical surfaces before coating. | |
| Oct 19, 2011 at 18:50 | history | edited | Jean-Yves | CC BY-SA 3.0 |
As suggested, promoted my comment to an answer
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| Oct 19, 2011 at 13:37 | comment | added | Tom Andersen | - cold welding - if you somehow mill two pieces of metal perfectly along some known crystal plane, then put them together, how would you later tell where they were joined? - You can't - which means you have 'cold welded' the metals. In the real world you don't get that to happen full on, but in vacuum it happens enough to prove a bother when building satellites, etc. | |
| Oct 19, 2011 at 4:44 | comment | added | Vineet Menon | they say it as "cold welding".... | |
| Oct 18, 2011 at 23:52 | comment | added | Niel de Beaudrap | @Jolow: you should promote that second comment into an edit of your answer. | |
| Oct 18, 2011 at 15:26 | comment | added | Jean-Yves | Take a copper plate. It is ideally made of copper atoms. Its surface will be dirty, filled with other molecules. If you now imagine that you have the tool to clean it so well that just the copper atoms are on the surface and nothing else, you will actually get a very reactive - in the chemical sense - surface. "Naked" atoms will bind to anything that passes by, and if you try to make something slide over it, they will make bounds and stick very well. | |
| Oct 18, 2011 at 14:58 | comment | added | claws | yes! yes! Thats exactly what I mean. Could you explain why? | |
| Oct 18, 2011 at 14:53 | history | answered | Jean-Yves | CC BY-SA 3.0 |