• I think the whole crack forms at once. So the speed would be infinite!
  •,%20Bottles,%20and%20Glass/glass_break.wmv Exactly as I suspected...
  • Actually, physical phenomena like this can only travel at the speed of sound for the medium in which they are traveling. For glass, that's on the order of 5000 meters/second. So, for a 10 cm (4 inch) crack, it would take 0.0005 seconds for the crack to propagate. That's pretty dang fast!

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