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Spinning Skater

Pull your arms in, drop a ring or catch a ball on a rod. Find the new spin.

Physics · Class 11 · Angular momentum is kept · 8 simulations. For JEE, NEET and your boards.

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What you'll learn

  1. Arms in: No outside torque: L = Iω stays the same
  2. Drop a ring: Mass added at the rim: I grows, ω drops
  3. Shrinking star: A shrinking star spins faster
  4. Wheel on a stool: Start from rest: the total L stays zero
  5. Ball into a rod: A sticky hit: keep L, then use energy
  6. String snaps tight: A jerk through the pivot: L about it stays
  7. Putty hits the tip (JEE Adv): Hit, then swing: find how high
  8. Blobs on a spinner (JEE Adv): Blobs join a spinner: L stays, KE drops