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A rock as small in mass as a few grams, impacting with a relative speed as low as 30 mph (48 kph), can cause a fracture in older glass. There is no standard or constant strength for auto glass. It would depending on the type of glass, its age, and any existing micro-flaws in the glass lattice. Sometimes a small chip will expand into a crack with thermal expansion in the hot sun. Other times, a windshield can resemble the cratered surface of the Moon and never crack or fail.

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Q: What is the amount of force needed to crack a windshield with a small rock?
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