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Mechanics—Rotational, continued
Ring and Discs—
Demonstration Kit
By: The Flinn Staff
A ring and disc of equal mass and diameter speed down an inclined plane. Which
one wins? Not an easy prediction to make but the victor will be clear. Results are
explained using concepts of inertia, rotational inertia and potential and kinetic
energy. Once students understand the results of the first race, they predict the
outcome of a race between the ring and two discs—the second disc being larger
than the first. Includes instructions and detailed mathematical explanation of results.
Catalog No. Description Price/Each
AP4634 Ring and Discs—Demonstration Kit $19.95
Celt
Tap the Celt on either end and watch it spin. Spin the Celt clockwise and it will stop
and spin in the other direction. What causes the Celt to spin this way?
Catalog No. Description Price/Each
AP1972 Celt $5.35
Moment of Inertia Set
Each wand is equal in mass, but the mass of one wand is evenly distributed while the
mass on the other wand can be moved along its length. Students will feel the dramatic
difference between the efforts they use to rotate each wand. The second demonstration
illustrates how changing the moment of inertia of a ring affects the speed at
which it rolls down an inclined plane. Each ring has the same mass, but again, the
mass distribution can be changed on one of the rings. Which ring will roll faster?
Catalog No. Description Price/Each
AP6714 Moment of Inertia Set $147.00
Variable Inertia Kit
Students get involved by varying the distribution of large steel ball bearings inside
the hollow, compartmentalized plastic discs. They can make the discs “center heavy”
or “rim heavy” and see dramatically the effects of rotational inertia as they run them
down an inclined plane. Comes complete with two disc setups, experiment suggestions,
and explanations of the theory.
Catalog No. Description Price/Each
AP4633 Variable Inertia Kit $19.85
MECHANICS—ROTATIONAL continued on next page.
Variable
Inertia Kit
AP4633
Figure Skating Dumbbells—
Demonstration Kit
AP6840, etc.
Figure Skating Dumbbells—
Demonstration Kit
By: The Flinn Staff
Quickly demonstrate angular momentum—with a twist! Stand on a rotating platform
holding the dumbbells straight out. After a slow rotation is applied, pull in the dumbbells
as close to your body as possible. Your students will be astonished with how
fast you spin—just like a figure skater at the Olympics. This simple demonstration
effectively illustrates the concepts of angular momentum, and it is safe for students
to have their own hands-on experience. A reproducible student worksheet, detailed
background information, and complete demonstration instructions are provided.
Note: Rotational turntable is required and available separately.
Catalog No. Description Price/Each
AP6840 Figure Skating Dumbbells—Demonstration Kit $33.20
AP4609 Rotational Turntable 60.80
Ring and Discs—
Demonstration Kit
AP4634
Gyroscope
Bicycle Wheel
AP4610
Gyroscope Bicycle Wheel
By: The Flinn Staff
Amaze your students with an object that appears
to defy gravity! Twist the handles of the spinning handheld bicycle wheel and feel the
peculiar body sensation associated with gyroscopic motion. The resulting resistance
illustrates the use of gyroscopes as stabilizers and navigational devices. Stand on
a rotational turntable and dramatically demonstrate the conservation of angular
momentum—you are bound to have your students’ undivided attention. For a real
crowd-pleasing demonstration, tie a rope to an eye screw in one of the handles of
the spinning wheel and it will “violate” gravity as it refuses to topple over—but it will
precess. Comes completely assembled with spoked bicycle wheel, handles with hand
grips and eye screws. Advanced background information and activity instructions are
included. See free video at flinnsci.com.
Catalog No. Description Price/Each
AP4610 Gyroscope Bicycle Wheel $128.00
AP4609 Rotational Turntable 60.80
Celt
AP1972
Moment of
Inertia Set
AP6714
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