1D55.10 Broken Ring Bowling


Newton's first law


A small ball bearing moves in a circle inside a broken ring, eventually reaching the break and continuing in a straight line towards one of several miniature bowling pins.



  • [1] Broken ring
  • [1] Ball bearing
  • [5] Miniature bowling pin
  • [1] Level
  • [1] Set of shims
  • [1] Document camera or overhead projector

Classroom Assembly

  1. Place the broken ring apparatus under a document camera or on a projector.
  2. Use the shims and thumbscrews to level the apparatus.
  3. Test the levelling by dropping a ball onto the Plexiglas.
  4. Remove the ring cover.
  5. Launch the ring a couple of times to see where it ends up.
  6. Place one of the bowling pins there. Place the other pins as possible other choices in a multiple choice question.


  1. Make students guess which pin will be hit.
  2. Launch the ball.


Additional Resources


  • PIRA 1D55.10


  • Don't attempt this at home!

Last revised

  • 2017


Related AV

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If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.