Which Way Is Down?

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  • Published on:  Thursday, November 2, 2017
  • BRAIN CANDY LIVE http://www.braincandylive.com/tickets
    THE VSAUCE CURIOSITY BOX: https://www.curiositybox.com/
    Links to sources and to learn more below!

    my twitter https://twitter.com/tweetsauce
    my instagram https://www.instagram.com/electricpants

    Thanks to Eric Langlay (https://www.youtube.com/user/ericdrav...) for producing, editing, and animating this episode with me. Thanks also to Henry Reich (https://www.youtube.com/user/minuteph...) for his advice and guidance.

    Universe Sandbox² : http://universesandbox.com/

    Mass vs weight:

    https://en.wikipedia.org/wiki/Mass_ve...
    Great Veritasium video: https://www.youtube.com/watch?v=_Z0X0...
    two other great videos: https://www.youtube.com/watch?v=6ccIj... and https://www.youtube.com/watch?v=aCqQz...

    baseballs coming together under gravitational attraction can be simulated in Universe Sandbox 2. More math behind it can be found here: https://www.reddit.com/r/explainlikei...

    Weight to mass (on surface of Earth) convertor: https://www.convertunits.com/from/kil...

    pencil and Earth falling numbers: https://www.quora.com/When-we-drop-a-...

    NASA HD footage: https://archive.org/details/NASA-Ultr...

    Buoyancy: https://en.wikipedia.org/wiki/Buoyancy

    Earth’s spin and its effect on ‘down’: http://www.freemars.org/jeff/Earth/do...

    The measurement of Earth and its gravity:

    https://en.wikipedia.org/wiki/Geodesy
    https://en.wikipedia.org/wiki/Physica...

    Movement of Earth’s center of mass:

    http://www.aiub.unibe.ch/research/slr...
    http://www.massentransporte.de/index....
    http://citeseerx.ist.psu.edu/viewdoc/...

    you get heavier before you get lighter as you descend into Earth: https://www.reddit.com/r/askscience/c...

    vertical deflection:

    https://en.wikipedia.org/wiki/Vertica...

    practical uses of measuring gravity: https://en.wikipedia.org/wiki/Gravimetry

    geoid:

    https://en.wikipedia.org/wiki/Geoid
    https://oceanservice.noaa.gov/facts/g...
    https://www.youtube.com/watch?v=jOQl8...

    Interactive Earth geoid: https://experiments.withgoogle.com/ch...

    your weight when moon is overhead: https://www.thenakedscientists.com/fo...

    Hammer and feather drop on moon: https://nssdc.gsfc.nasa.gov/planetary...

    Why things fall at the same rate: https://www.quora.com/If-an-object-ha...

    Wolfram Alpha cone geodesic tool: http://demonstrations.wolfram.com/Con...

    General Relativity:

    simple animation showing geodesic on cone and how it causes motion DOWN in space: https://www.youtube.com/watch?v=DdC0Q...
    GREAT pbs spacetime video (watch the whole channel): https://www.youtube.com/watch?v=AwhKZ...
    http://www.askamathematician.com/2009...
    https://www.av8n.com/physics/geodesic...
    http://www.pitt.edu/~jdnorton/teachin...
    http://www.einstein-online.info/spotl...

    time and gravity:

    https://www.youtube.com/watch?v=jlTVI...
    https://www.okclips.net/video/1ENkP0h8nAg/video.html
    https://www.okclips.net/video/gcvq1DAM-DE/video.html
    https://www.reddit.com/r/askscience/c...
    https://www.reddit.com/r/AskScienceDi...

    tests of general relativity: https://en.wikipedia.org/wiki/Tests_o...

    RECOMENDED BOOKS:

    great introductory texts:

    “Relativity Visualized” by Lewis Carroll Epstein https://www.amazon.com/Relativity-Exp...

    There’s also this PDF that takes Epstein’s diagrams into more detail: http://www.relativity.li/uploads/pdf/...

    “Relativity Simply Explained” by Martin Gardener https://www.amazon.com/Relativity-Exp...

    great intro to the math of general relativity:

    “A Most Incomprehensible Thing: Notes Towards a Very Gentle Introduction to the Mathematics of Relativity” by Peter Collier https://www.amazon.com/Most-Incompreh...

    Requires some background in relevant math topics (see above) but very very good:

    “Spacetime And Geometry: An Introduction To General Relativity” by Sean Carrol https://www.amazon.com/gp/product/933...
  • Source: https://youtu.be/Xc4xYacTu-E
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