I’ve certainly observed this in the past. I was hoping for some explanation for this. It definitely seems to have something to do with density. Obviously before you lift something a subconscious process is deciding how much force to apply. So I just assume that for things that aren’t really heavy (that is, they aren’t straining our capacity to lift them) our perception of weight is more about the relationship between how hard it was and how hard some we “thought” it was going to be.
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