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Groups > sci.physics.relativity > #598019
| From | Athel Cornish-Bowden <acornish@imm.cnrs.fr> |
|---|---|
| Newsgroups | sci.physics.relativity |
| Subject | Re: What is the force that the Earth used to keep us on the ground? |
| Date | 2022-12-22 09:44 +0100 |
| Message-ID | <k0ijn0F486qU1@mid.individual.net> (permalink) |
| References | (13 earlier) <63A20261.2821@ix.netcom.com> <238058ce-b644-4853-b31a-3ca0f50f0624n@googlegroups.com> <tnu4e7$v1qk$1@dont-email.me> <k0fk40FkmgnU1@mid.individual.net> <tnvpt9$1449k$1@dont-email.me> |
On 2022-12-21 20:22:01 +0000, Volney said: > On 12/21/2022 12:32 AM, whodat wrote: >> On 12/20/2022 11:09 PM, Volney wrote: >>> On 12/20/2022 2:01 PM, mitchr...@gmail.com wrote: >>>> On Tuesday, December 20, 2022 at 10:43:38 AM UTC-8, The Starmaker wrote: >>> >>>>> You need to understand the textbook defintion of the >>>>> word..."accelerate". Coming to a stop is...accelerating. >>>> >>>> No. That is slowing down. There is both acceleration and deceleration. >>>> And there is still forward motion... >>> >>> Roy, he said the textbook definition of accelerate. Roy, deceleration >>> is nothing more than a negative acceleration. My impression is that "deceleration" is a layman's word, useful enough to describe the effect of braking on the movement of a car, but not much in serious writing about physics or mechanics. Acceleration is a vector, and doesn't just apply to forward motion, or even to forward and backward motion, but to acceleration to the left or right, or up or down, or any combination of these. > See, Roy? That's another use for negative numbers, which you don't understand! >> >> I hate to have to point this out, but since acceleration is any change >> in speed or direction there is no such a thing has "negative >> acceleration." That expression is an impossibility as a science >> based word. The concept of slowing down exists of course, but the >> nomenclature is limited by the broad definition of the word accelerate. >> >> What frosts me even more is that I have to acknowledge that our resident >> troll is correct. >> > > In ordinary mechanics (physics) there is no deceleration, acceleration > is a vector which can add to or subtract from the velocity vector [over > time] or act at an angle such as an orbiting planet. Its components can > be positive or negative. In one dimension it can be represented as a > positive or negative number along the x axis. > > An exception is friction, which always opposes the velocity relative to > whatever it has frictional contact with. This opposition to the motion > is seen as deceleration. Slide an object across the floor and it slows > and stops on the floor or "decelerates". When it stops there is no > longer any deceleration (or acceleration for that matter), the > acceleration is 0. -- Athel -- French and British, living in Marseilles for 36+ years; mainly in England until 1987.
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What is the force that the Earth used to keep us on the ground? The Starmaker <starmaker@ix.netcom.com> - 2022-12-16 22:29 -0800
Re: What is the force that the Earth used to keep us on the ground? patdolan <patdolan@comcast.net> - 2022-12-17 09:31 -0800
Re: What is the force that the Earth used to keep us on the ground? Richard Hertz <hertz778@gmail.com> - 2022-12-17 10:26 -0800
Re: What is the force that the Earth used to keep us on the ground? "mitchr...@gmail.com" <mitchrae3323@gmail.com> - 2022-12-17 10:44 -0800
Re: What is the force that the Earth used to keep us on the ground? patdolan <patdolan@comcast.net> - 2022-12-17 11:20 -0800
Re: What is the force that the Earth used to keep us on the ground? "Paul B. Andersen" <paul.b.andersen@paulba.no> - 2022-12-17 22:31 +0100
Re: What is the force that the Earth used to keep us on the ground? Richard Hertz <hertz778@gmail.com> - 2022-12-17 13:40 -0800
Re: What is the force that the Earth used to keep us on the ground? patdolan <patdolan@comcast.net> - 2022-12-17 16:02 -0800
Re: What is the force that the Earth used to keep us on the ground? Richard Hertz <hertz778@gmail.com> - 2022-12-17 16:18 -0800
Re: What is the force that the Earth used to keep us on the ground? The Starmaker <starmaker@ix.netcom.com> - 2022-12-17 22:18 -0800
Cretin Pat Dolan demonstrates once again that his ibecility extends to basic mathematics "Dono." <eggy20011951@gmail.com> - 2022-12-17 16:57 -0800
Re: Cretin Pat Dolan demonstrates once again that his ibecility extends to basic mathematics patdolan <patdolan@comcast.net> - 2022-12-17 17:24 -0800
Re: Cretin Pat Dolan demonstrates once again that his ibecility extends to basic mathematics "Dono." <eggy20011951@gmail.com> - 2022-12-17 17:45 -0800
Re: Cretin Pat Dolan demonstrates once again that his ibecility extends to basic mathematics patdolan <patdolan@comcast.net> - 2022-12-17 17:51 -0800
Re: Cretin Pat Dolan demonstrates once again that his ibecility extends to basic mathematics "Dono." <eggy20011951@gmail.com> - 2022-12-17 17:53 -0800
Re: Cretin Pat Dolan demonstrates once again that his ibecility extends to basic mathematics Athel Cornish-Bowden <acornish@imm.cnrs.fr> - 2022-12-18 09:45 +0100
Re: Cretin Pat Dolan demonstrates once again that his ibecility extends to basic mathematics Maciej Wozniak <maluwozniak@gmail.com> - 2022-12-18 00:49 -0800
Re: Cretin Pat Dolan demonstrates once again that his ibecility extends to basic mathematics patdolan <patdolan@comcast.net> - 2022-12-17 18:20 -0800
Re: What is the force that the Earth used to keep us on the ground? The Starmaker <starmaker@ix.netcom.com> - 2022-12-17 22:11 -0800
Re: What is the force that the Earth used to keep us on the ground? "Paul B. Andersen" <paul.b.andersen@paulba.no> - 2022-12-18 13:09 +0100
Re: What is the force that the Earth used to keep us on the ground? Vitaliy Bazzoli <zvt@viavzl.oi> - 2022-12-18 18:06 +0000
Re: What is the force that the Earth used to keep us on the ground? The Starmaker <starmaker@ix.netcom.com> - 2022-12-18 12:15 -0800
Re: What is the force that the Earth used to keep us on the ground? The Starmaker <starmaker@ix.netcom.com> - 2022-12-19 11:44 -0800
Re: What is the force that the Earth used to keep us on the ground? patdolan <patdolan@comcast.net> - 2022-12-17 15:51 -0800
Crank Pat Dolan puts foot in mouth "Dono." <eggy20011951@gmail.com> - 2022-12-17 16:53 -0800
Re: Crank Pat Dolan puts foot in mouth Richard Hertz <hertz778@gmail.com> - 2022-12-17 17:21 -0800
Re: Crank Pat Dolan puts foot in mouth "Dono." <eggy20011951@gmail.com> - 2022-12-17 17:23 -0800
Re: What is the force that the Earth used to keep us on the ground? "Paul B. Andersen" <paul.b.andersen@paulba.no> - 2022-12-18 13:19 +0100
Re: What is the force that the Earth used to keep us on the ground? patdolan <patdolan@comcast.net> - 2022-12-18 10:23 -0800
Re: What is the force that the Earth used to keep us on the ground? patdolan <patdolan@comcast.net> - 2022-12-18 10:29 -0800
Re: What is the force that the Earth used to keep us on the ground? "Dono." <eggy20011951@gmail.com> - 2022-12-18 10:30 -0800
Re: What is the force that the Earth used to keep us on the ground? Athel Cornish-Bowden <acornish@imm.cnrs.fr> - 2022-12-18 19:34 +0100
Re: What is the force that the Earth used to keep us on the ground? patdolan <patdolan@comcast.net> - 2022-12-19 11:52 -0800
Re: What is the force that the Earth used to keep us on the ground? Paul Alsing <pnalsing@gmail.com> - 2022-12-19 19:58 -0800
Re: What is the force that the Earth used to keep us on the ground? Maciej Wozniak <maluwozniak@gmail.com> - 2022-12-19 23:52 -0800
Re: What is the force that the Earth used to keep us on the ground? Athel Cornish-Bowden <acornish@imm.cnrs.fr> - 2022-12-20 08:53 +0100
Re: What is the force that the Earth used to keep us on the ground? patdolan <patdolan@comcast.net> - 2022-12-20 00:37 -0800
Re: What is the force that the Earth used to keep us on the ground? Athel Cornish-Bowden <acornish@imm.cnrs.fr> - 2022-12-20 11:11 +0100
Re: What is the force that the Earth used to keep us on the ground? patdolan <patdolan@comcast.net> - 2022-12-20 10:34 -0800
Re: What is the force that the Earth used to keep us on the ground? The Starmaker <starmaker@ix.netcom.com> - 2022-12-20 10:43 -0800
Re: What is the force that the Earth used to keep us on the ground? "mitchr...@gmail.com" <mitchrae3323@gmail.com> - 2022-12-20 11:01 -0800
Re: What is the force that the Earth used to keep us on the ground? Volney <volney@invalid.invalid> - 2022-12-21 00:09 -0500
Re: What is the force that the Earth used to keep us on the ground? whodat <whodaat@void.nowgre.com> - 2022-12-20 23:32 -0600
Re: What is the force that the Earth used to keep us on the ground? Volney <volney@invalid.invalid> - 2022-12-21 15:22 -0500
Re: What is the force that the Earth used to keep us on the ground? Michelle Africano <nccr@amenica.he> - 2022-12-21 20:27 +0000
Re: What is the force that the Earth used to keep us on the ground? nospam@de-ster.demon.nl (J. J. Lodder) - 2022-12-21 21:52 +0100
Re: What is the force that the Earth used to keep us on the ground? Tom Roberts <tjoberts137@sbcglobal.net> - 2022-12-21 16:52 -0600
Re: What is the force that the Earth used to keep us on the ground? Michelle Africano <nccr@amenica.he> - 2022-12-21 23:00 +0000
Re: What is the force that the Earth used to keep us on the ground? nospam@de-ster.demon.nl (J. J. Lodder) - 2022-12-22 14:14 +0100
Re: What is the force that the Earth used to keep us on the ground? whodat <whodaat@void.nowgre.com> - 2022-12-21 14:52 -0600
Re: What is the force that the Earth used to keep us on the ground? Tom Roberts <tjoberts137@sbcglobal.net> - 2022-12-21 17:03 -0600
Re: What is the force that the Earth used to keep us on the ground? Richard Hertz <hertz778@gmail.com> - 2022-12-21 15:25 -0800
Re: What is the force that the Earth used to keep us on the ground? Richard Hertz <hertz778@gmail.com> - 2022-12-21 16:51 -0800
Re: What is the force that the Earth used to keep us on the ground? The Starmaker <starmaker@ix.netcom.com> - 2022-12-21 19:40 -0800
Re: What is the force that the Earth used to keep us on the ground? The Starmaker <starmaker@ix.netcom.com> - 2022-12-21 19:58 -0800
Re: What is the force that the Earth used to keep us on the ground? The Starmaker <starmaker@ix.netcom.com> - 2022-12-22 14:38 -0800
Re: What is the force that the Earth used to keep us on the ground? whodat <whodaat@void.nowgre.com> - 2022-12-21 21:55 -0600
Re: What is the force that the Earth used to keep us on the ground? Volney <volney@invalid.invalid> - 2022-12-23 02:26 -0500
Crank Dick Hertz fails classical kinemnatics "Dono." <eggy20011951@gmail.com> - 2022-12-23 11:08 -0800
Re: What is the force that the Earth used to keep us on the ground? Michelle Africano <nccr@amenica.he> - 2022-12-21 23:25 +0000
Re: What is the force that the Earth used to keep us on the ground? whodat <whodaat@void.nowgre.com> - 2022-12-21 21:53 -0600
Re: What is the force that the Earth used to keep us on the ground? Rico Amato <toaa@araocco.rt> - 2022-12-22 16:04 +0000
Re: What is the force that the Earth used to keep us on the ground? whodat <whodaat@void.nowgre.com> - 2022-12-22 12:41 -0600
Re: What is the force that the Earth used to keep us on the ground? nospam@de-ster.demon.nl (J. J. Lodder) - 2022-12-22 11:53 +0100
Re: What is the force that the Earth used to keep us on the ground? Rico Amato <toaa@araocco.rt> - 2022-12-22 15:57 +0000
Re: What is the force that the Earth used to keep us on the ground? Volney <volney@invalid.invalid> - 2022-12-22 23:43 -0500
Re: What is the force that the Earth used to keep us on the ground? Rico Amato <toaa@araocco.rt> - 2022-12-23 18:59 +0000
Re: What is the force that the Earth used to keep us on the ground? whodat <whodaat@void.nowgre.com> - 2022-12-23 16:43 -0600
Re: What is the force that the Earth used to keep us on the ground? nospam@de-ster.demon.nl (J. J. Lodder) - 2022-12-22 11:53 +0100
Re: What is the force that the Earth used to keep us on the ground? Athel Cornish-Bowden <acornish@imm.cnrs.fr> - 2022-12-22 09:44 +0100
Re: What is the force that the Earth used to keep us on the ground? Maciej Wozniak <maluwozniak@gmail.com> - 2022-12-22 02:15 -0800
Re: What is the force that the Earth used to keep us on the ground? Richard Hertz <hertz778@gmail.com> - 2022-12-21 05:18 -0800
Re: What is the force that the Earth used to keep us on the ground? Volney <volney@invalid.invalid> - 2022-12-21 15:38 -0500
Re: What is the force that the Earth used to keep us on the ground? "mitchr...@gmail.com" <mitchrae3323@gmail.com> - 2022-12-21 11:43 -0800
Re: What is the force that the Earth used to keep us on the ground? Michelle Africano <nccr@amenica.he> - 2022-12-21 19:53 +0000
Re: What is the force that the Earth used to keep us on the ground? "mitchr...@gmail.com" <mitchrae3323@gmail.com> - 2022-12-21 20:14 -0800
Re: What is the force that the Earth used to keep us on the ground? patdolan <patdolan@comcast.net> - 2022-12-21 20:51 -0800
Re: What is the force that the Earth used to keep us on the ground? whodat <whodaat@void.nowgre.com> - 2022-12-20 14:15 -0600
Re: What is the force that the Earth used to keep us on the ground? "Paul B. Andersen" <paul.b.andersen@paulba.no> - 2022-12-19 14:23 +0100
Re: What is the force that the Earth used to keep us on the ground? Richard Hertz <hertz778@gmail.com> - 2022-12-19 05:54 -0800
Re: What is the force that the Earth used to keep us on the ground? "Paul B. Andersen" <paul.b.andersen@paulba.no> - 2022-12-20 20:20 +0100
Re: What is the force that the Earth used to keep us on the ground? Maciej Wozniak <maluwozniak@gmail.com> - 2022-12-20 12:03 -0800
Re: What is the force that the Earth used to keep us on the ground? Maciej Wozniak <maluwozniak@gmail.com> - 2022-12-19 08:46 -0800
Re: What is the force that the Earth used to keep us on the ground? patdolan <patdolan@comcast.net> - 2022-12-19 09:21 -0800
Re: What is the force that the Earth used to keep us on the ground? The Starmaker <starmaker@ix.netcom.com> - 2022-12-19 11:38 -0800
Re: What is the force that the Earth used to keep us on the ground? patdolan <patdolan@comcast.net> - 2022-12-19 11:52 -0800
Re: What is the force that the Earth used to keep us on the ground? The Starmaker <starmaker@ix.netcom.com> - 2022-12-19 23:03 -0800
Re: What is the force that the Earth used to keep us on the ground? "mitchr...@gmail.com" <mitchrae3323@gmail.com> - 2022-12-17 18:40 -0800
Re: What is the force that the Earth used to keep us on the ground? The Starmaker <starmaker@ix.netcom.com> - 2022-12-17 22:09 -0800
Re: What is the force that the Earth used to keep us on the ground? The Starmaker <starmaker@ix.netcom.com> - 2022-12-17 23:47 -0800
Re: What is the force that the Earth used to keep us on the ground? Paul Alsing <pnalsing@gmail.com> - 2022-12-17 23:54 -0800
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