Is Gravity An Illusion? Video

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Most of us take gravity as an assumed part of our living realities, but why? Basic physics introduces us to the concept of gravity from a Newtonian sense, but when you start factoring Einstein into an understanding of gravity, things get… weird. For example, gravity may simply not exist. Why? Watch this week’s episode of PBS Space Time and find out why gravity may be an illusion!

Extra Credit:

1960 Frames of Reference video (abridged version)
https://www.youtube.com/watch?v=Y75kEf8xLxI

1960 Frames of Reference video (full version)
https://archive.org/details/frames_of_reference

SmarterEveryDay Baffling Balloon Physics
https://www.youtube.com/watch?v=y8mzDvpKzfY

Einstein 1907 paper (translation) on the equivalence principle
http://www.pitt.edu/~jdnorton/teaching/GR&Grav_2007/pdf/Einstein_1907.pdf

Additional info the equivalence principle
http://www.einstein-online.info/spotlights/equivalence_principle

PBS Learning Media animation about frames of reference:
http://www.pbslearningmedia.org/resource/lsps07.sci.phys.fund.frameref/frames-of-reference/

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Miguel Portela
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