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Product 13240

By: Robert Farber, Central High School, Philadelphia, PA

In the Bottle Balance Beam Demonstration Kit for physical science and physics, the water bottle and wooden board seem to defy gravity. An attention-getting and memorable demonstration of the concept of the center of gravity.

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Product Details

This balancing act will be a real attention getter! Students will remember the concept of the center of gravity involved in this demonstration. A large water-filled bottle and a wooden board seem to defy gravity as together they balance on the board’s edge. You have to see it to believe it! Includes detailed instructions and a reproducible student worksheet.
Concepts: Center of gravity, gravity, balance.
Time Required: 10 minutes
Note: An innovative density demonstration can also be performed using blue kerosene and mineral oil, available separately.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Engaging in argument from evidence

Disciplinary Core Ideas

MS-PS2.A: Forces and Motion
HS-PS2.A: Forces and Motion

Crosscutting Concepts

Cause and effect

Performance Expectations

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.
HS-PS1-7: Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction.