MadSci Network: Physics |
I did a science fair project on friction. I build a slide ramp and slid down a block of wood (one inch by one inch), a block of wood wrappedin foil and a block of wood wrapped in cellophane. I slid each object down the ramp five times at room temperature and again after they were in the freezer for three hours. The angle required to make them slide was higher when they were frozen. I hypothesized that because molecules move closer together when cooled then the surface imperfections would reduce which would reduce friction. Any ideas I did not see this?
Re: Why would cooling an object like wood and metal increase its friction?
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