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World 2 · Pull It Until It Breaks · 12 min · PRO

Cracks and fatigue

How strong things break anyway

PRO · Materials Testing Lab

World 2: Pull It Until It Breaks is part of PRO

The first world of Materials Testing Lab is free. PRO opens the other 25 lessons in 6 worlds — simulations, quizzes and all.

  • Stress and strain
  • Hooke’s law and Young’s modulus
  • Yield, necking and fracture
  • Stiff, strong or tough?
  • Steel is iron with a pinch of carbon
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  • All 60 labs — every world, every lesson
  • Practice exams and certificates

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