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Since 1977

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firewatch

When an oblong, boat-shaped object—known as a celt, rattleback or wobblestone—is rotated about its vertical axis in a particular direction, it will stop rotating, begin oscillating, and then spin in the opposite direction. Here’s how to construct your own mysterious celt from an ordinary spoon.

Concepts

  • Conservation of Energy
  • Rotational Motion
  • Inertia