# Talk:123: Centrifugal Force

Are you allowed to describe a force acting upon you when you are in an accelerating reference frame? I'm pretty sure you're not. The explanation says that from bond's point of view, he is at rest. Well, sort of. If you're in an accelerating car you can tell that you're not at rest because your inertia seems to be "pulling" you backwards. There's nothing actually pulling you, though. 108.162.219.202 05:24, 30 December 2013 (UTC)

- According to general relativity, that inertial "pull" is indistinguishable from being at rest with a force being applied. In the rotating frame, this apparent force is the centrifugal force. 199.27.128.62 05:58, 4 February 2014 (UTC)
- the explanation is correct, and you can describe forces acting on you in non-inertial frames. If you take Bond to be the origin of a rotating frame of reference then the position of Bond will be (0,0,0) at all times. So in that frame of reference, Bond is at rest (not "sort of at rest, really at rest). The equation of motion for Bond is

F + Fe + Fw + Fc = ma = 0

- (F is external force, Fe is the force due to angular acceleration of the frame (relative to some inertial frame), Fw is centrifugal force and Fc is coriolis force )
- Since the sum of the three "fictious" force are nonzero, and Bond is at rest in this frame, the force F must also be non-zero. This force F is the inward push of the centrifuge. In the moving car example, you can't tell if you are accelerating or if there is a massive graviational field pulling you backwards. From your perspective the experience is identical. If you take this idea and run with it you get general relavitity141.101.70.67 11:30, 6 August 2014 (UTC)

- I believe the OP is referencing the vestibular system. This is what allows humans to feel acceleration. The actual physics at hand is regarding reference frames, not the ability of the body to detect acceleration. In regards to the question of "Are you allowed to describe a force acting upon you when you are in an accelerating reference frame?", the answer is yes. You can pick whichever reference frame you wish, but we tend to pick the one that simplifies the calculations the most.Flewk (talk) 06:44, 25 December 2015 (UTC)

"Apparent force" is the best term to use to describe centrifugal force, and could be inserted in the text to clarify. 172.68.142.89 21:14, 14 June 2018 (UTC)

- "The surface of the Earth approximates an inertial frame."

This isn't correct at all. If you're standing on Earth, you're experiencing an acceleration of 9.8 m/s^2. 108.162.238.11 00:56, 12 April 2018 (UTC)

- Actually, that is incorrect. Right now i'm in my desk chair, not accelerating. The force of gravity is cancelled out by the force my chair exerts on me to maintain this status quo. You're correct that it's not an inertial frame, but that is because the
*force*of gravity, not some*acceleration*141.101.77.20 12 - 14, 6 July 2018 (UTC)

It's NOT appropriate that lazy science teachers "lie to children" in that and various other ways. The kids can understand far more than the teachers assume, so that their choices of limitation are self-fulfilling prophecy, producing ignorant victims of the public school system. — Kazvorpal (talk) 01:39, 21 September 2019 (UTC)