Path: csiph.com!news.redatomik.org!aioe.org!.POSTED!not-for-mail From: The Starmaker Newsgroups: sci.physics.relativity Subject: Re: Let's Get This Straight. Is Free Falling 'Inertial' or Is it NOT? Date: Sun, 29 Jan 2017 11:52:31 -0800 Organization: Aioe.org NNTP Server Lines: 55 Message-ID: <588E47FF.F26@ix.netcom.com> References: <588D51A9.3D3F@ix.netcom.com> <588DABB2.7B39@ix.netcom.com> Reply-To: starmaker@ix.netcom.com NNTP-Posting-Host: X9ItFNC7Zcz4l6MobL/YRA.user.gioia.aioe.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@aioe.org X-Notice: Filtered by postfilter v. 0.8.2 X-Mailer: Mozilla 3.04Gold (WinNT; U) Xref: csiph.com sci.physics.relativity:407141 The Starmaker wrote: > > Sylvia Else wrote: > > > > On 29/01/2017 1:21 PM, The Starmaker wrote: > > > Sylvia Else wrote: > > >> > > >> On 28/01/2017 6:58 AM, HGW, DSc. wrote: > > >>> To a person on the ground, an object falling to Earth is accelerating, > > >>> as in dv/dt (ignore air). It also appears to be accelerating relative to > > >>> Earth when viewed from the moon. ...yet it has been claimed here that > > >>> the state of free fall is inertial. > > >>> Note, all massive objects in the universe are freely 'falling' so can > > >>> their 'reference frames' be regarded as inertial? > > >> > > >> A person on the ground is not inertial, so the requirement that the laws > > >> of physics by the same for all inertial observers does not apply to the > > >> person on the ground. An inertial body accelerates in the frame of a > > >> non-inertial observer. > > >> > > >> As for massive bodies being inertial, the problem is that, in common > > >> with all observers, the volume of space regarded as being inertial for > > >> the observer is that volume where the gravitational field doesn't vary > > >> significantly in either intensity or direction. A massive body itself > > >> creates a field that varies in intensity and direction, so the volume of > > >> space regarded as inertial is much smaller than the body. > > >> > > >> Sylvia. > > > > > > > > > > > > the person on the ground is falling.. > > > > > > > > > people fall in holes... > > > > While person is falling into a hole, and not touching anything, they're > > inertial (ignoring air resistance). Before they started to fall, they > > were not inertial. When they reach the bottom of the hole, they're again > > not inertial. > > > > Sylvia. > > (i was thinking of a bottom less hole) > > i'm a little confused, the earth is faling with the person at the same > time... > if they are both falling at the sametime...where is the resistance? birds don't fly, they fall...but they create a resistance with their wings. i'm not creating any resistance.