Rotational Inertia Accessory

Product Code: ME-3420


Add the Rotational Inertia Accessory to any PASCO 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.

Coupled Pendulums

Couple two pendulums with a rubber band and plot the Position vs. Time for each pendulum. The result is a vivid example of energy transfer between the pendulums.

Large Amplitude Pendulum

By placing one mass on each end of the tube, the pendulum will oscillate slowly. Students will have time to view the motion of the pendulum, while also watching the real-time graph of displacement, velocity, and acceleration vs. time. The period can be measured as a function of the amplitude of the pendulum and compared to theory.

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.

What’s Included

  • 1x Disks : 8.9 cm diameter, 100 g
  • 1x Thin Ring: 8.9 cm o.d., 7.9 cm i.d., 100 g
  • 1x 38 cm Pendulum Rod (27 g)
  • 2x 75 g Mass
  • 1x Clamp-on Super Pulley
  • 1x Alignment Guides: 3.9 cm radius, 1.7 g

Experiment Library

Perform the following experiments and more with the Rotational Inertia Accessory.
Visit PASCO’s Experiment Library to view all activities for this product.

Product Specifications

Disk Mass 100 g
Ring Mass 100 g
Disk Diameter 8.9 cm
Ring Diameter 8.9 cm O.D., 7.9 cm I.D.
Rod Mass 28 g
Rod Dimensions 0.8 cm diameter, 38 cm long
Brass Masses 75 g
Alignment Guide Mass 2 g

Supporting Documents

Rotational Inertia Accessory Kit Instruction Sheet

Super Pulley with Clamp Manual