Mini Rotational Accessory - CI-6691



Add the CI-6691 Mini-Rotational Accessory to the Rotary Motion Sensor to study the oscillations of a pendulum, the rotational inertia of an aluminum disk, a steel ring and a metal rod, as well as the conservation of momentum during a rotational collision. The clamp-on Super Pulley allows students to apply a torque by hanging a mass over the pulley.

Typical Applications

  • Calculating Moment of Inertia (Rotational Inertia)
  • Investigating Conservation of Angular Momentum
  • Studying Coupled Pendula
  • Setting up a large Amplitude Pendulum


  • Rotating Disk (9.5 cm diameter, 120 g)
  • Large Ring Mass (465 g)
  • 38 cm Pendulum Rod (27 g)
  • 75 gram Masses (quantity 2)
  • Clamp-On Super Pulley
  • Spool of black nylon thread
  • How It Works

    Conservation of Angular Momentum:

    • To demonstrate conservation of angular momentum, a non-rotating ring is dropped onto a rotating disk. The angular velocity of the disk is recorded in real-time, and students can easily determine the angular velocities of the disk just before and after the ring is dropped. Combining these velocities with the rotational inertia of the disk and ring, students can confirm that angular momentum is conserved.


    Disk Diameter
    • 9.5 cm
    Ring Diameters
    • 5.4 cm inside diameter
    • 7.6 cm outside diameter
    Rod Length
    • 38 cm
    • 75 g each


    Buying Guide

    PASPORT Rotary Motion Sensor
    PASPORT Rotary Motion Sensor   PS-2120A