Rotational Moment of Inertia Apparatus
Product Code : EL-AMLE-10634
Quick Answer: This apparatus uses the three-string pendulum method, together with a photoelectric sensor and time-counting device, to measure the torsional oscillation period of a hanging plate and determine the moment of inertia of a rigid body. Since moment of inertia depends on an object's mass distribution and shaft position, students can use the setup to measure the moment of inertia of two objects of the same mass but different mass distribution and to verify the parallel axis theorem.
This apparatus uses the three-string pendulum method to determine the moment of inertia of a rigid body, a physical quantity representing the inertial amount of a rotational object that depends on the body's mass distribution and shaft position. A photoelectric sensor combined with a time-counting device measures the torsional oscillation period of a hanging plate, and through these experiments students can understand the physical principle of moment of inertia and learn the measurement methods related to it.
Using this apparatus, the following experiments can be conducted:
Measure the moment of inertia using the three-string pendulum method.
Measure the moment of inertia of two objects of same mass but with different mass distribution.
Verify the parallel axis theorem of moment of inertia.
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Last Updated: September 2026
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