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Fidget spinner

Stress-relieving toy

  • 4 min read
  • 3 chapters

Related on Lably

Through Plastic, Metal and Angular momentum

Structure and physics

Fidget spinners are typically made of rubber or metal, with a central ball bearing and several prongs extending outward. The ball bearing consists of small metal balls that roll between an inner and outer race, allowing the spinner to rotate smoothly around its axis. When a prong is flicked, the spinner rotates around the bearing with minimal resistance due to the rolling motion of the balls inside the bearing.

The design also distributes mass away from the center, increasing the moment of inertia, which helps maintain rotational motion. As the spinner rotates, it behaves like a gyroscope, resisting changes to its orientation due to angular momentum. Over time, the speed of rotation decreases following an exponential decay pattern, meaning that while it slows gradually, it cannot spin indefinitely.

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