The centre of mass of an object is the point where its mass may be thought to be concentrated.
When a suspended object is in equilibrium, its centre of mass is directly beneath the point of suspension.
The centre of mass of a symmetrical object is along the axis of symmetry.
To keep an object stable, it's centre of mass must be above it's base. The object will topple if it's line of action is outside it's base (if it's resultant moment about it's point of turning is not zero).
The stability of an obet can be increased by increasing its base, or making its centre of mass as low as possible.
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