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Aug 6, 2015 at 19:20 vote accept mins
Aug 7, 2015 at 9:25
Aug 6, 2015 at 19:16 comment added mins The video helped. In the course of this search about 0-G, I read a a couple of articles about weight and its confusing uses. I feel this extends to (micro)gravity and weightless(ness).
Aug 6, 2015 at 17:27 comment added David White The normal force is not fictitious. While I am standing on the floor, there is a force stopping me from falling through the floor. This force is pushing perpendicular to the floor (hence the name "normal" force) and straight up, directly balancing the force of gravity, such that there is no NET vertical force on me. If you have a physics book available, read more about the normal force or look here:khanacademy.org/science/physics/forces-newtons-laws/…
Aug 6, 2015 at 17:19 comment added mins Hi David. It's a very clear explanation, thanks. Would you say the force preventing free fall is a fictitious force, due to the choice of the Earth frame of reference? If this is the case, any link that would allow me to dig further?
Aug 6, 2015 at 17:13 history answered David White CC BY-SA 3.0