Quick Answer:The Moment of Inertia Model is a pair of I-shaped metal pipe assemblies with the same total mass, one with its washers near the axis and one with them at the ends, making a simple moment of inertia kit for showing that rotational inertia depends on mass distribution.
Last updated: 18 October 2026
Key Features
Two assemblies of identical total mass.
Durable I-shaped metal pipe construction.
Thick metal washers welded in place.
One centre-weighted and one end-weighted assembly.
Technical Specifications
Specification
Value
Assemblies
2, identical total mass
Construction
I-shaped metal pipe
Masses
Thick metal washers, welded
Assembly A
Washers near the central axis
Assembly B
Washers at the outer ends
How It Is Used
Students twist each assembly about its centre and compare: the end-weighted one is harder to set turning and to stop than the centre-weighted one, even though both have the same mass. This makes the idea I = Σmr² concrete and shows why more torque is needed for the same angular acceleration.
Frequently Asked Questions
Do both parts of the Moment of Inertia Model have the same mass?
Yes. The two assemblies have identical total mass; only the position of the welded washers differs, near the axis on one and at the ends on the other.
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