Which Way Is Down?
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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