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PHYSICS Rotational Inertia Set


Release two different sized objects simultaneously.


How It Works


Compare rotational inertias of objects with different shapes and sizes. Students learn that the speed of an object rolling down the ramp is not affected by its mass or radius. The shape or distribution of the mass determines the outcome. The sphere will reach the bottom first, followed by the disk. The ring will be last.


Rotational Inertia Set ME-9774


Ask two students to rotate seemingly identical wands as rapidly as they can. No matter how strong the students are, the one rotating the red wand will always be faster.


Rotational Inertia Wands


These two wands have the same mass and the same dimensions, and yet the red wand is easier to rotate. Why? The red wand has two metal slugs near its center, while the blue wand has two similar slugs at its ends.


Students get to experience for themselves that rotational inertia depends not only on the mass, but also on how that mass is distributed relative to the axis of rotation. Small openings in the wands allow students to see where the masses are located and solve the mystery.


Includes 10 cm outer diameter set - Solid Sphere (810 g) - Ring (Aluminum, 230 g) - Disk (Plastic, 370 g)


5 cm outer diameter set - Solid Sphere (110 g) - Ring (Aluminum, 90 g) - Disk (Plastic, 70 g) Release Mechanism


Spherical Mass Set


Hollow Steel Ball


This set includes four balls with a diameter of 25 mm each, but featuring various masses and rotational inertias.


Rotational Inertia Wands ME-9847


Includes one red wand and one blue wand


TYPICAL APPLICATIONS


A Race the hollow steel ball and solid aluminum ball down an incline. They have about the same mass, but the solid aluminum ball has a much larger acceleration down the ramp.


A Fire the yellow plastic, solid steel, and hollow steel balls from a PASCO Short- or Long-Range Projectile Launcher.


Spherical Mass Set ME-8968


Specifications: Length: 1 m Ratio of blue rotational inertia to red: Approx. 6


98 877.373.0300 (inside US)


Includes Solid Yellow Nylon Ball (10 grams) Solid Steel Ball (66 grams) Hollow Steel Ball (21 grams) Solid Aluminum Ball (24 grams) (release mechanism not included)


916.462.8383 (outside US)


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