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Fascinating Finger Balance—Demonstration Kit

By: The Flinn Staff

Item #: AP6640 

Price: FREE

Temporarily out of stock; call for availability.

Fascinating Finger Balance Demonstration Kit for physical science and physics is a simple and seemingly paradoxical device that demonstrates the center of gravity.

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Product Details

Here’s a paradox—a device that remains balanced when a heavy plastic tube dangles from one end while being supported at the opposite end by a single fingertip. Remove the tube and the device falls. How can this be? It’s center of gravity! This simple device will be a real show-stopper as you introduce your students to the concept of center of gravity. Includes demonstration instructions.

Concepts: Center of gravity, balance, stability.
Time Required: 15 minutes


Materials Included in Kit: 
Plastic tubing, ¼", 3
Tear-dropped shape balance device

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Asking questions and defining problems
Developing and using models
Constructing explanations and designing solutions

Disciplinary Core Ideas

MS-PS2.A: Forces and Motion
MS-PS2.B: Types of Interactions
HS-PS2.A: Forces and Motion
HS-PS2.B: Types of Interactions

Crosscutting Concepts

Systems and system models
Stability and change

Performance Expectations

HS-PS1-1: Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.
HS-PS1-2: Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.
MS-PS2-2: Plan an investigation to provide evidence that the change in an object’s motion depends on the sum of the forces on the object and the mass of the object