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The secret of "degravitation"
The fine piano wire supporting part of the weight begins to vibrate when the disc rotates at its resonance frequency. As the motor increases speed, when this frequency is reached, the wire begins to vibrate imperceptibly. In doing so, it exerts tension on its load, which is immediately reflected by the electronic scale.
Imagine that you decide to weigh yourself while also doing pull-ups. If you pull on your arms while watching the scale's needle, you will conclude that exercise makes you lose weight.
Another experiment would consist of attaching a substantial weight to a cello string, partially resting on the platform of an electronic scale. By rubbing the string with a bow, you could conclude that music can produce a degravitation effect.
