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Skill 8 of 10
In Progress

Rolling (advanced)

  • Let go of a wooden block in a smooth bowl. It slides up the other side.
  • Let go of it in a rough bowl, and it does not reach as high up.

Of course not. The rough surfaces counteracts the sliding.

  • Now, let a marble roll in a smooth bowl. It sways up an down along the sides.
  • Let a marble roll in a rough bowl and it also sways up an down, but now it reaches higher up!

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