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Does a centrifuge weigh more when it's spinning?

  1. Oct 7, 2012 #1
    This may or may not be a crazy question but do centrifuges weigh more when they're spinning? Perhaps I'm misunderstanding g-force, weight and centrifugal force.
  2. jcsd
  3. Oct 7, 2012 #2
    its mass does not change, neither does its weight.

    also, gyroscopes do not lose mass when they spin, contrary to what Laithwaite said. they don't resist gravity. they resist tilting.

    and that guy invented maglev by the way.
  4. Oct 8, 2012 #3
    Not strictly correct. When spun up there is greater total stress-energy-momentum = rest energy + rotational KE + other terms, and gravity acts on the sum of these. Will be a tiny addition, but is there.
    His experiments did show a reduced weight! However it can be explained aerodynamically, and if he had performed those experiments in a vacuum, nothing would have shown. Laithwaite had something in common with Thomas Gold. Both had strokes of genius thinking in certain directions, but goofed really badly in others.
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