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World 2 · Newton & Friction · 5 min · PRO

Friction & Mass

Does a heavier ball roll differently?

PRO · Forces & Motion

World 2: Newton & Friction is part of PRO

The first world of Forces & Motion is free. PRO opens the other 50 lessons in 11 worlds — simulations, quizzes and all.

  • Inertia
  • Force on a Ramp
  • Steeper Is Faster
  • Gentle Slopes
  • Mass on a Ramp
PRO includes
  • All 26 labs — every world, every lesson
  • Practice exams and certificates

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← Friction GripsFriction Shortens the Trip →

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