1Q10.30-Rolling Ring, Disk, and Sphere


Video: Watch this demo

Instructor’s video

Description: This demonstration shows the conservation of mechanical energy.
It also shows objects with different moments of inertia accelerate at different speeds.


  • Wooden Ramp
  • Round sphere, Disk, and Open ring with same diameter
  • Meter sick

Demonstration Procedure:

  1. Position the three objects on the top of the ramp and hold them there with a meter stick.
  2. When ready, release the meter stick so all objects start at the same time.
  3. Note which ones move down the ramp the fastest.