Center of Gravity and Stability
How is an object's center of gravity related to its stability?
If you gently tip the object and the center of gravity rises, it is in stable
equilibrium. An example of this is a cone, base down. If the center of gravity
lowers when gently tipped, it is in unstable equilibrium, as with a cone balanced
on its tip. If the center of gravity goes neither up nor down, as a cone on its
side, it is in neutral equilibrium.
A good conceptual physics source that is easy to read and will help you is:
Paul Hewitt "Conceptual Physics" Addison-Wesley
---Nathan A. Unterman
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Update: June 2012