2007-06-25 06:05:07 · 3 answers · asked by Anonymous in Games & Recreation ➔ Hobbies & Crafts
It has to do with some layers stretching more than others. http://www.sciam.com/article.cfm?articleID=C1D895DF-E7F2-99DF-3D6901FDFEA92212
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2007-06-25 06:13:24 · answer #1 · answered by Kacky 7 · 0⤊ 0⤋
The rubbing compresses the fibers on that side of the ribbon. Materials tend to bend toward the side that's compressed. The rubbing also bends the ribbon.
Compare to cutting a strip from an aluminum can. To flatten it, you might use the back of a spoon. Using the edge of something produces a more acute bend. It's not that material has been removed.
2007-06-25 22:22:20 · answer #2 · answered by h_brida 6 · 0⤊ 0⤋
Because you've lessened the RIGIDITY of one side of the ribbon.
Ribbon, in it's normal, un-blade-rubbed form, has a certain consistency on BOTH sides.
When you rub the blade across, it essentially "shaves" some of that consistency off, and the equilibrium that was there before, is destroyed, causing the ribbon to curl.
2007-06-25 06:15:13 · answer #3 · answered by dudmission 1 · 1⤊ 0⤋