This eagle balances on almost anything - your finger, a pencil, or the edge of your desk. Its center of mass (or center of gravity) is generally beneath the tip of its beak. Students can change the eagle's center of gravity by adding small pieces of tape or paperclips to have it to balance perfectly. Our proud bird can even be used to demonstrate rotational inertia! Just balance it on a pencil above your head, and turn around 360 degrees. The bird will remain in the same orientation due to its fairly large moment of inertia. Each comes individually packaged with a stand. Approx. 16 cm (~6") wing span. Colors may vary.
Read more on our Blog - Center of Gravity on a Tightrope
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Nov 21, 2018 | By Galen Hall of Union City, TN United States
Owner Response:Well, that certainly shouldn't be! We will send out a new balancing bird immediately.
Jun 3, 2018 | By Chris of Greensburg, PA United States
Mar 3, 2017 | By Sian of Walnut Creek, CA United States
Apr 21, 2016 | By Bernardo Rawnicki of Westfield, NJ United States
Review of item
Dec 18, 2014 | By Mary Kelly of Dedham, MA United States
Oct 2, 2014 | By Caleb of Riverside, CA United States
Owner Response:Sorry Caleb! I just checked our stock, and what we have on the shelves seem totally fine, but as with any mass produced product, I suppose there is potential for an error to occur. We are more than happy to exchange your birds so they are perfectly balanced. This is such a cool demo, and we wouldn't want it to be anything less than perfect!
Balancing Bird Demo
Sep 20, 2014 | By Marjory Kopp of Hudsonville, MI United States
Great to get students engaged
May 27, 2014 | By Roberta Wallace of galloway, NJ United States
Always a favorite
Feb 13, 2013 | By Science Teacher of Palo Alto, CA United States
Jun 8, 2012 | By Jack Ruolo of New york, NY United States
May 29, 2012 | By Connie Goochee of Philadelphia, PA United States
May 23, 2012 | By Justin Son of Marlboro, NJ United States
May 23, 2012 | By J.S. of Marlboro, NJ United States
May 22, 2012 | By Sue Brooks of Litchfield, CT United States
Balancing Birds Mystify
May 18, 2012 | By Sabrina of Aurora, CO United States
May 16, 2012 | By Judith L. Schriver of Warfordsburg, PA United States
This product will support your students' understanding of the Next Generation Science Standards (NGSS)*, as shown in the table below.
Suggested Science Idea(s) 3-PS2-1
| Elementary || || Middle School || || High School |
| 3-PS2-1 |
Students can use the Balancing Bird in the plan and to conduct an investigation to provide evidence of the effects of balanced and unbalanced forces on the motion of an object. 3-PS2-2
Students can use the Balancing Bird to make observations and/or measurements of an object's motion to provide evidence that a pattern can be used to predict future motion.
| || MS-PS2-2 |
Students can use the Balancing Bird in the plan of 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. MS-PS2-4
Students can use the Balancing Bird in an investigation to construct and present arguments using evidence to support the claim that gravitational interactions are attractive and depend on the masses of interacting objects.
| || HS-PS2-4 |
Students can use the Balancing Bird as an introduction to an investigation to use mathematical representations of Newton's Law of Gravitation to predict the gravitational forces between objects.
Students can use the Balancing Bird in an investigation to understand Center of Mass. It will maintain its equilibrium at nearly all times, and will recover from a great degree of upset. The bird's balance point is its beak. Students can further explore disrupting the state of equilibrium by adding paperclips to the wings, pressing down on one wing or the tail.
Students can investigate their own center of mass by standing on their left foot on a block of wood. What happens to their body when you ask them to reach left with their left arm? Their right arm and right leg will move to regain balance or Center of Mass. How does this resemble the Balancing Bird? Ask them how center of mass helps in riding a bike, skateboard, surfboard, or snowboard.
* NGSS is a registered trademark of Achieve. Neither Achieve nor the lead states and partners that developed the Next Generation Science Standards were involved in the production of, and do not endorse, this product.