Timeline for Do you weigh more with suction cups under your feet on the scale?
Current License: CC BY-SA 4.0
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| Jul 18, 2022 at 18:20 | comment | added | rob♦ | Vacuum doesn’t exert a force. The scale is calibrated so that it reads “zero” when the air is pushing down on it. If you put some object on the scale that gets in the way of the air, the air pushes down on that object instead — except slightly less, because the air pressure at the top of the object is a little less. The difference is the buoyant force. Proving that the buoyant force is independent of shape is a homework exercise. | |
| Jul 18, 2022 at 17:40 | comment | added | Marijn | But doesn't the vacuum between feet and scale decrease the upward force so you become heavier? (In my example you can forget the extra weight of the cups itself; before and after you made them vacuum the mass is the same (exept the smal amount of air; but you can leave that to)) | |
| Jul 18, 2022 at 2:58 | history | answered | rob♦ | CC BY-SA 4.0 |