Gravity /electromagnetism /measuring

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Discussion Overview

The discussion revolves around a thought experiment involving a lorry on a weighbridge containing a suspended weight, exploring the implications of electromagnetism on weight measurement. The scope includes conceptual reasoning and hypothetical scenarios related to gravity and electromagnetism.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant proposes a scenario where a 100kg weight is suspended by electromagnets inside a lorry, questioning whether the lorry would weigh 100kg less when the magnets are activated.
  • Another participant asserts that the lorry weighs the same regardless of the suspended weight.
  • A further scenario is introduced involving a lorry filled with seagulls that hover in midair, questioning if the weight remains the same in this case.
  • One participant confirms that the weight remains the same and references a Mythbusters episode that supports this idea.

Areas of Agreement / Disagreement

Participants express differing views on whether the weight of the lorry changes when the weight is suspended by electromagnets, indicating a lack of consensus on the matter.

Contextual Notes

The discussion does not resolve the assumptions regarding the effects of electromagnetism on weight measurement and relies on hypothetical scenarios that may not account for all variables involved.

forcecarrier
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had a thought experiment like this , a lorry is on a weighbridge inside is a 100kg weight surrounded above and below by 2 perfectly calibrated electromagnets, when the the magnets are switched on the weight is suspended in mid air ,does the lorry weigh 100kg less and does the above magnet need slightly more power than the one below assuming both are pulling toward ? hope this isn't too stupid!
 
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The lorry weighs the same.
 
what about if the lorry is full of seagulls and one moment they are all at rest then on the weighbridge they all hover in midair , same weight ?
 
Yes, of course. Btw, Mythbusters did an excellent show on that myth, confirming the physics.
 

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