The secret of "degravitation"
A thin piano string supporting part of the weight starts to vibrate when the disc turns at its resonance frequency. As the motor turns at an increasing speed, when this frequency is reached, the string starts to vibrate imperceptibly. In doing so, it exerts a 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 deduce that music can produce a degravitation effect.
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