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Transcript of session 3
The point through which its whole weight appears to act for any orientation of the object Centre of gravity depends on:
Distribution of density / weight
Regular shaped object - uniformed distribution
eg. "uniformed metre rule"
-> CG at geometrical centre How do we locate CG on an irregular shaped (non-uniformed density) object? Stability
The ability of an object to return to its original position after it has been tilted slightly. Stable Equilibrium
CG rises and then falls back again.
The line of action of the weight lies within the base area of object.
There is an anticlockwise moment of the weight about point of contact.
CG falls and continues to fall further
The line of action of the weight lies outside of the base area of the object.
There is a clockwise moment of the weight about point of contact. Neutral Equilibrium
CG neither rises nor falls.
The line of action of the weight and reaction force always conincide.
There is no moment.