Motion
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From: Don1 on 18 Sep 2005 10:40 Motion is a change in position, during time, and is relative to the position and motion of the observers: There are three kinds of motion: 1) Inertial motion; where a body persevers to remain at rest or move at a uniform speed in a single direction; which can be written mathematically as Velocity (v=l/t). 2) Forced displacement in inertial motion where rates of displacement can be written mathematically as a/2=(vt-vi)/t=s/t. 3) Resultant motion is the algebraic sum of inertial motion and forced displacement, and can be written mathematically as d/t=l/t + s/t; or as d/t=l/t + (a/2)t^2: Don
From: donstockbauer on 18 Sep 2005 13:11 And my left earlobe itches.
From: Herman Trivilino on 18 Sep 2005 13:15 "Don1" <dcshead(a)charter.net> wrote ... > 3) Resultant motion is the algebraic sum of inertial motion and forced > displacement, and can be written mathematically as d/t=l/t + s/t; or as > d/t=l/t + (a/2)t^2: I thought my example of the motion of the Plymouth Prowler made it clear to you that this formulation gives results that don't match the way cars really move. Is it not supposed to do that?! ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =----
From: Sam Wormley on 18 Sep 2005 13:43 Newton is much more precise http://scienceworld.wolfram.com/physics/NewtonsLaws.html 1. (Law of inertia): A body at rest remains at rest and a body in motion continues to move at a constant velocity unless acted upon by an external force. 2. A force F acting on a body gives it an acceleration a which is in the direction of the force and has magnitude inversely proportional to the mass m of the body: F = ma . Here F is the applied force, m is the mass of the particle, and a = dv/dt is the particle's acceleration, with v being the particle's velocity. This equation, together with the principle that bodies act symmetrically on one another (Newton's third law--so that the force particle A feels from particle B is equal to the force B feels from A--is the basis for understanding particle dynamics". 3. Whenever a body exerts a force on another body, the latter exerts a force of equal magnitude and opposite direction on the former. This is known as the weak law of action and reaction. "Newton's [second] law completely describes all the phenomena of classical mechanics...."
From: oriel36 on 18 Sep 2005 14:04
To Sam et al. What have I told you before. Newton worked off mean Sun/Earth distances and concentrated on variations from the mean distances rather than mean motions along the orbits as Kepler did *. As Newton concocted a geocentric/heliocentric orbital equivalency cut from the cloth of Flamsteed's axial rotation/stellar circumpolar equivalency you can get the stretching of distances alright but you cannot fit the sidereal format which facilitates the geocentric/heliocentric equivalency into a Keplerian framework. http://www.pfm.howard.edu/astronomy/Chaisson/AT401/IMAGES/AACHCIR0.JPG Go ahead,under the Newtonian scheme,a constant .986 degree orbital displacement in an elliptical framework generates the unsightly spectacle of the Earth moving faster at the aphelion and slower at the perihelion.You get the correct stretching of distances but the rest is nothing but a giant fudge . If you can't figure it out join the rest of the numbskulls who are helpless before Newton's deceitful maneuverings.What did you think,that Albert was up to that peevish tyrannt.All Albert did was highlight and expand on Newton and he is not to blame,just a harmless guy making the 1898 fictional 'Time Machine' novel seem possible in an era when they thought they could build a machine for everything. Newton is where the real substance is at but even he was not safe from his disciples tampering for he never said F=ma and that geometry applied to planetary motion never,ever worked. |