Rigid Object In Static Equilibrium

1. Dec 17, 2012

Bashyboy

Hello,

I am currently reading the about the topic mentioned in the title of this thread. In my textbook, the author gives the example with the wine-bottle and it's holder (I attached a photo). In this example, the author states that in order for this to be in static equilibrium, the second condition, $\sum \vec{\tau}_{ext}=0$, which can only be satisfied when the center of gravity of the system is directly over the support point.

Could someone explain why the center of gravity has to be directly over the support?

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2. Dec 17, 2012