center of gravity. we have been… can we…? what path did they follow? both follow a parabolic...
TRANSCRIPT
Center of Gravity
We have been…
Can we…?
What path did they follow?
Both follow a parabolic path But bat wobbles around a certain point
Center of Gravity This point follows a parabolic path The rest does not
Center of Gravity is at the center of weight distribution
Symmetrical geometrical center
Not Symmetrical toward heavier end
Wobbling Toys Dense Bottom
Wobble Toys
Center of Gravity Sometimes called Center of Mass
Point of average mass distribution For objects near – interchangeable In space, center of mass (NOT gravity)
Center of Gravity of Moon Closer to Earth than the center of mass Nearer parts pulled more by Gravity
But for everyday objects - same
Center of Gravity
Center of Gravity of Meter Stick Point where balance Entire weight behaves as if concentrated at one
point
Finding Center of Gravity Suspend an object and mark with a vertical line
Change point of suspension and mark 2nd line
Point of intersection is the Center of Gravity
Center of Gravity
Center of Gravity may be where no material is…
Lean Back?
Toppling – Why? “Weeble Wobble
Theorem” An object whose center of
gravity is above its base of support will not topple
If center of gravity outside area of support topple
Designs
Low Center of Gravity and Wide Base
Balancing Toys
Weighted so Center of Gravity vertically under support point with the remainder above
Center of Gravity and People
When you stand straight up, center of gravity in the body is 2-3 cm below belly button and centered between the front and back
Center of gravity lower in women
Center of Gravity and People
Touch Toes – Where is the Center of Gravity?
Center of Gravity and People
When Standing Center of gravity above support base (area
bounded by feet) Baby
Trouble coordinating center of gravity above feet when walking
Center of Gravity
Stand on Toes Smaller Base
Pregnant Woman Lean backwards so center of gravity is above the
base Pigeon
Jerks head so center of gravity is above supporting base
More Examples