Inquiries on Vacuum Sphere: Spinning and Weight Difference

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Discussion Overview

The discussion revolves around the behavior of an object spinning within a vacuum sphere, specifically addressing the effects of vacuum on spinning motion and the perceived weight of the object. The inquiry includes both theoretical considerations and practical implications.

Discussion Character

  • Exploratory, Technical explanation

Main Points Raised

  • Steve questions whether an item spun within a vacuum sphere would spin freely or face opposing forces.
  • Some participants suggest that while a vacuum reduces aerodynamic drag, friction from bearings would still affect the spinning object.
  • It is noted that a vacuum does not influence gravitational forces, implying that the object's weight remains unchanged.
  • Steve expresses interest in using opposing magnets to potentially reduce the weight of the spinning object.
  • Another participant confirms that magnetic bearings can reduce friction but will not change the object's weight.

Areas of Agreement / Disagreement

Participants generally agree that the weight of the object remains unchanged in a vacuum and that friction will still be a factor, although there is some exploration of alternative methods to reduce this friction.

Contextual Notes

The discussion does not resolve the effectiveness of using opposing magnets to alter the perceived weight or the feasibility of spinning objects in a vacuum sphere.

SPS
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Hi to you all,

May I just say I am not a physicist or the like so my questions may seem a bit green to you all, I wish to make something and need a little bit of info please.

With regards to a vacuum sphere, if I was to spin an item within it would it spin freely or would there be forces against it? Second silly question, does an item within the sphere become any lighter/heavier or no difference?

I hope the questions are worthy of a reply

Kind Regards

Steve
 
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The vacuum will reduce aerodynamic drag, but that's all (assuming the sphere remains on Earth). You still have to deal with friction from the bearings supporting your spinning object.
A vacuum has no effect on gravity, so the relative weight of your object will not change.
 
Thanks Pantaz for your reply, I am hoping i may be able to use opposing magnets to reduce the weight of my spinning object

Regards

Steve
 
Magnetic bearings will reduce (but not eliminate) friction. Weight will be unchanged.
 

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