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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   / tweetsauce   my instagram   / electricpants   Thanks to Eric Langlay (   / ericdraven30  ) for producing, editing, and animating this episode with me. Thanks also to Henry Reich (   / minutephysics  ) for his advice and guidance. Universe Sandbox² : http://universesandbox.com/ Mass vs weight: https://en.wikipedia.org/wiki/Mass_ve... Great Veritasium video:    • The Difference Between Mass and Weight   two other great videos:    • cartoon treat weight vs mass   and    • conceptual physics Mass Vs Weight   baseballs coming together under gravitational attraction can be simulated in Universe Sandbox 2. More math behind it can be found here:   / eli5_will_two_baseballs_a_foot_apart_in_deep   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:   / do_you_get_lighter_the_further_underground...   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...    • gravitational field lines and equipot...   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:    • General Relativity : Einstein vs. Newton   GREAT pbs spacetime video (watch the whole channel):    • General Relativity & Curved Spacetime...   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:    • How Gravity Makes Things Fall      • Gravity's effect on the flow of time ...      • Gravitational Time Dilation causes gr...     / bending_of_space_not_responsible_for_objects     / does_time_dilation_cause_gravity_or_the_ot...   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...