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  1. #1
    Look! My Spine! RubenX's Avatar
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    Foo MythBusting Thread

    This is simple, if you know of a myth that could possibly get busted, post it here and suggest some kind of test. If some other Fooster can test it, please do and post the results here. I'll start:

    Antigravity fields & Magnets

    The myth says that you can create a simple contraption that will create some kind of antigravity field, canceling some of the earth's gravity forces on it. To make the contraption:

    1) Get 2 big speaker magnets.
    2) Get a screw and some washers and nuts.
    3) Use the screw, washers and nuts to force the 2 magnets together, with the repelling poles facing each other (the 2 south or the 2 north).

    Now go to a high place and let it fall. Science says that every object falls at the same rate regardless of weight, with an acceleration of 9.8ms^2. The myth says that this antigravity contraption will fall at a measurable slower rate.

    Anybody wanna test this? Any other myth you want some other Fooster to test?

  2. #2
    My name is Mike, not Cal
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    Ha, cool. I don't have a myth to bust, but I just want to say how creepy the Google ads in the OP are--all nuts and screws and stuff. I know I'm a bit late, but I stopped visiting BF shortly after the ads appeared and just came back.
    "I got my lips chewed off by a dingo!" --David Letterman

  3. #3
    Lone Star Tex_Arcana's Avatar
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    What about using those rare earth magnets advertised next to your post?

  4. #4
    Domestic Domestique UnsafeAlpine's Avatar
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    I don't believe it. I have, however, made an "anti-gravity" machine.

    You'll need:

    a copper pipe and a pvc pipe both of the same diameter roughly 6 feet long.
    two magnets that fit into the pipes.

    Copper is great for this, but you should be able to do it with aluminum or some other non-ferrous material.

    What you do:

    Drop both magnets down the tubes at the same time. Every time you do it, the magnet in the copper pipe will come out slower than the pvc pipe.

    Why does this happen:

    Copper is non-ferrous meaning it is non-magnetic. The magnet is not slowed by some sort of attraction between the copper and the magnet, so what makes it work?

  5. #5
    Science Fanboy KrisPistofferson's Avatar
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    Armor All on the rims makes caliper brakes quit sqeaking.
    Quote Originally Posted by Christopher Hitchens
    What can be asserted without proof can be dismissed without proof.

  6. #6
    Look! My Spine! RubenX's Avatar
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    Children weight more when sleeping.

  7. #7
    Senior Member Michigander's Avatar
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    You can plug a bunch of wound up wire into the wall and it will lift off the ground, but heat up very quickly. That's the simplest, but most dangerous method. Youtube has a lot of instructional videos to make safer versions.
    Bring back the Sig Test!


    (\__/)
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  8. #8
    Senior Member Buglady's Avatar
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    Quote Originally Posted by RubenX View Post
    Children weight more when sleeping.
    So do cats. It's the damndest thing.

  9. #9
    BF's Level 12 Wizard SingingSabre's Avatar
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    Quote Originally Posted by KrisPistofferson View Post
    Armor All on the rims makes caliper brakes quit sqeaking.
    Shameless plug (my sites):
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    Quote Originally Posted by Bklyn
    Obviously, the guy's like a 12th level white wizard or something. His mere presence is a danger to mortals.

  10. #10
    Senior Member
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    5 foot high spoilers on Civics make them go faster. Even when the engine isn't running.

  11. #11
    AEO
    AEO is offline
    Senior Member AEO's Avatar
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    pcad goes faster on a cervelo
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  12. #12
    T-Shirt Guy ehidle's Avatar
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    Quote Originally Posted by KrisPistofferson View Post
    Armor All on the rims makes caliper brakes quit working.
    De-Mythed it for you...
    Yellow + Blue Jerseys!

    Get your Cranky T-Shirt!
    Men's
    and Women's designs available

  13. #13
    T-Shirt Guy ehidle's Avatar
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    Myth: Wearing a Team Discovery kit and riding a Tre..... oh nevermind...
    Yellow + Blue Jerseys!

    Get your Cranky T-Shirt!
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  14. #14
    AEO
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    I don't know about you, but my trek team discovery jersey was $20. and I ride cannondale and rossin.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  15. #15
    Senior Member DannoXYZ's Avatar
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    Quote Originally Posted by UnsafeAlpine View Post
    Why does this happen:

    Copper is non-ferrous meaning it is non-magnetic. The magnet is not slowed by some sort of attraction between the copper and the magnet, so what makes it work?
    A moving magnetic field (falling magnet) will induce an electric current at right-angles to its direction of travel. In this case, around the circumference of the pipe. The moving electric current will then generate a magnetic-field at right-angles to ITS direction of travel. This mag-field will oppose the original mag-field of the falling magnet and resist its movement. However, since we don't have 100% efficient conversion of magnetism-to-electricity-to-magnetism, the generated opposing field is less than the original, thus only slowing the magnet's travel.

    In a superconducting scenario, you CAN levitate the magnet...

  16. #16
    Domestic Domestique UnsafeAlpine's Avatar
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    Quote Originally Posted by DannoXYZ View Post
    A moving magnetic field (falling magnet) will induce an electric current at right-angles to its direction of travel. In this case, across the circumference of the pipe. A moving electric current will generate a magnetic-field at right-angles to ITS direction of travel. This mag-field will oppose the original mag-field of the falling magnet and resist its movement. However, since we don't have 100% efficient conversion of magnetism-to-electricity-to-magnetism, the generated opposing field is less than the original, thus only slowing the magnet's travel.

    In a superconducting scenario, you CAN levitate the magnet...
    Commonly known as eddy currents.

  17. #17
    You Know!? For Kids! jsharr's Avatar
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    Chloroform decreases libido

    I have been running field tests for a few years now. I guess I need to pull my notes and see.
    Are you a registered member? Why not? Click here to register. It's free and only takes 27 seconds! Help out the forums, abide by our community guidelines.
    Quote Originally Posted by colorider View Post
    Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.

  18. #18
    T-Shirt Guy ehidle's Avatar
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    Quote Originally Posted by DannoXYZ View Post
    A moving magnetic field (falling magnet) will induce an electric current at right-angles to its direction of travel. In this case, around the circumference of the pipe. The moving electric current will then generate a magnetic-field at right-angles to ITS direction of travel. This mag-field will oppose the original mag-field of the falling magnet and resist its movement. However, since we don't have 100% efficient conversion of magnetism-to-electricity-to-magnetism, the generated opposing field is less than the original, thus only slowing the magnet's travel.

    In a superconducting scenario, you CAN levitate the magnet...
    Let me say that far more succinctly...

    From my Masters Thesis of old:



    Yellow + Blue Jerseys!

    Get your Cranky T-Shirt!
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  19. #19
    Pwnerer Wordbiker's Avatar
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    jsharr is a witch.

    Test: Build a bridge out of him.
    Quote Originally Posted by ahsposo View Post
    Ski, bike and wish I was gay.

  20. #20
    Dude wheres my guads? skinnyone's Avatar
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    Quote Originally Posted by ehidle View Post
    Let me say that far more succinctly...

    From my Masters Thesis of old:



    Dude don't tell me you have one of those t-shirts!

  21. #21
    Banned. ModoVincere's Avatar
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    X has brain!
    UA uses a brain!

  22. #22
    Domestic Domestique UnsafeAlpine's Avatar
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    Quote Originally Posted by ModoVincere View Post
    X has brain!
    UA uses a brain!
    I have to use x's brain... Mine's been melted.

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