Assuming a perfect scale and a perfectly
still person, you should weigh the same amount
on one or two feet. However, I imagine that you
are slightly off balance when you try to stand
on one foot. As a result, you are putting more
force onto the balance as you adjust your weight
and try to stand still without falling over.
This force pushes against the balance, which
makes it appear as though your weight has
An alternative explanation is that you have a
poorly-designed balance, and if you have too
much pressure (that is, more force over a
smaller area), it distorts the measurement.
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