show video detail
Which Way Is Down?
- Published_at:2017-11-02
- Category:Entertainment
- Channel:Vsauce
- tags: gravity science math vsauce michael stevens einstien newton equations mass weight mass vs weight falling free fall geodesic curvature cone spacetime space time force earth geoid vertical deflection why do things fall why do things fall at same rate Galileo Galilei galileo heavy physics general relativity relativity special relativity modern physics geodesy line
- description: 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/ericdraven30) for producing, editing, and animating this episode with me. Thanks also to Henry Reich (https://www.youtube.com/user/minutephysics) for his advice and guidance. Universe Sandbox² : http://universesandbox.com/ Mass vs weight: https://en.wikipedia.org/wiki/Mass_versus_weight Great Veritasium video: https://www.youtube.com/watch?v=_Z0X0yE8Ioc two other great videos: https://www.youtube.com/watch?v=6ccIjRwYO9U and https://www.youtube.com/watch?v=aCqQzrPCcFM 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/explainlikeimfive/comments/2vyxl7/eli5_will_two_baseballs_a_foot_apart_in_deep/ Weight to mass (on surface of Earth) convertor: https://www.convertunits.com/from/kilograms/to/newton pencil and Earth falling numbers: https://www.quora.com/When-we-drop-a-pencil-the-earth-attracts-it-and-it-seems-that-the-pencil-is-falling-towards-earth-Why-doesnt-the-earth-come-up-towards-the-pencil NASA HD footage: https://archive.org/details/NASA-Ultra-High-Definition Buoyancy: https://en.wikipedia.org/wiki/Buoyancy Earth’s spin and its effect on ‘down’: http://www.freemars.org/jeff/Earth/down.htm The measurement of Earth and its gravity: https://en.wikipedia.org/wiki/Geodesy https://en.wikipedia.org/wiki/Physical_geodesy Movement of Earth’s center of mass: http://www.aiub.unibe.ch/research/slr_data_analysis/estimating_the_geocenter_and_earth_rotation_parameter/index_eng.html http://www.massentransporte.de/index.php?id=307 http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.650.4392&rep=rep1&type=pdf you get heavier before you get lighter as you descend into Earth: https://www.reddit.com/r/askscience/comments/4qfl52/do_you_get_lighter_the_further_underground_that/ vertical deflection: https://en.wikipedia.org/wiki/Vertical_deflection practical uses of measuring gravity: https://en.wikipedia.org/wiki/Gravimetry geoid: https://en.wikipedia.org/wiki/Geoid https://oceanservice.noaa.gov/facts/geoid.html https://www.youtube.com/watch?v=jOQl8DRzQks Interactive Earth geoid: https://experiments.withgoogle.com/chrome/geoid-viewer your weight when moon is overhead: https://www.thenakedscientists.com/forum/index.php?topic=11639.0 Hammer and feather drop on moon: https://nssdc.gsfc.nasa.gov/planetary/lunar/apollo_15_feather_drop.html Why things fall at the same rate: https://www.quora.com/If-an-object-has-more-mass-then-its-pull-on-earth-would-be-greater-than-an-object-with-less-mass-and-therefore-should-fall-to-earth-faster-Why-do-objects-of-different-mass-fall-to-earth-at-the-same-speed Wolfram Alpha cone geodesic tool: http://demonstrations.wolfram.com/ConeGeodesics/ General Relativity: simple animation showing geodesic on cone and how it causes motion DOWN in space: https://www.youtube.com/watch?v=DdC0QN6f3G4 GREAT pbs spacetime video (watch the whole channel): https://www.youtube.com/watch?v=AwhKZ3fd9JA http://www.askamathematician.com/2009/10/q-why-does-curved-space-time-cause-gravity/ https://www.av8n.com/physics/geodesics.htm#sec-straight http://www.pitt.edu/~jdnorton/teaching/HPS_0410/chapters/spacetime/ http://www.einstein-online.info/spotlights/geometry_force time and gravity: https://www.youtube.com/watch?v=jlTVIMOix3I https://youtu.be/1ENkP0h8nAg https://youtu.be/gcvq1DAM-DE https://www.reddit.com/r/askscience/comments/30lt1o/bending_of_space_not_responsible_for_objects/ https://www.reddit.com/r/AskScienceDiscussion/comments/3rfmtl/does_time_dilation_cause_gravity_or_the_other_way/ tests of general relativity: https://en.wikipedia.org/wiki/Tests_of_general_relativity RECOMENDED BOOKS: great introductory texts: “Relativity Visualized” by Lewis Carroll Epstein https://www.amazon.com/Relativity-Explained-Classics-Science-Mathematics/dp/0486293157 There’s also this PDF that takes Epstein’s diagrams into more detail: http://www.relativity.li/uploads/pdf/English/Epstein_en.pdf “Relativity Simply Explained” by Martin Gardener https://www.amazon.com/Relativity-Explained-Classics-Science-Mathematics/dp/0486293157 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-Incomprehensible-Thing-Introduction-Mathematics/dp/0957389469/ 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/9332571651/
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| 2017-11-04 | 2,442,632 | 165,732 | 22,595 |
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| 2017-11-05 | 3,065,030 | 185,765 | 24,960 |
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| 2017-11-06 | 3,401,207 | 198,918 | 26,199 |
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| 2017-11-07 | 3,624,514 | 206,908 | 27,005 |
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