Publication No. 12293
The balancing bird will yield hours of entertainment and learning. Students can even calculate the center of gravity of the balancing bird.
Balance, electronic or triple-beam, 0.1 g
Balancing bird with stand
Correlation to Next Generation Science Standards (NGSS)†
Science & Engineering PracticesUsing mathematics and computational thinking
Developing and using models
Constructing explanations and designing solutions
Disciplinary Core IdeasMS-PS2.A: Forces and Motion
MS-PS2.B: Types of Interactions
HS-PS2.A: Forces and Motion
Crosscutting ConceptsCause and effect
Structure and function
Stability and change
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
In order to find the center of gravity of the bird with the weights in it, the center of gravity of the x-axis and the center of gravity of the y-axis must be found. These values can be represented by the following equations:
Xcenter = (xAmA + xBmB + xCmC)/mtotal
where xA is the x coordinate of point A and mA is the mass acting at point A (the weight). The total mass of the bird and weights is mtotal.
Tipler, P. A. Physics for Scientists and Engineers; Worth: New York, 1991; pp 278–279.