Force of gravity/weight vecotr placement?

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In the discussion about the force of gravity and weight vector placement on a rectangular block, the focus is on determining the correct point from which to draw the weight vector when the block begins to tip. The key question is whether the weight vector should originate from the center of mass or the bottom of the object. It is clarified that the weight vector always acts through the center of mass, as this represents the average location of the object's mass. Understanding this placement is crucial for accurately analyzing the tipping point and the forces involved. The confusion arises from the practical implications of how these forces interact during the tipping process.
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we were doing a problem that involved pulling on a normal rectangular block with a horizontal force in class. at the point that it just barely starts tipping, we wanted to figure out the force required. i understood how to do that, but what puzzled me is the blocks weight/force of gravity vector placement. should it come form the object's center of mass, or the bottom of the object? and why? sorry, but this just made no sense to me at all.
 
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