Re: "Is There a Force of Gravity?"



Dear Daniel Weston:

"Daniel Weston" <daniel009@xxxxxxxxx> wrote in message
news:19964-435C569A-1003@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> It is often stated here that gravitation and acceleration are
> the same. This leads to seriously held statements that
> "gravity is not pulling me down in my chair, but rather the
> chair is accelerating up towards me". This only makes
> plausible sense if it is agreed that there is no peeking
> out the window.

This only makes "plausible sense" if gravity is not "action at a
distance". Note that Newton was bothered by this "action at a
distance" also.

Contact forces provide the sensation of gravity. Note that when
you throw a ball, and observe its "parabolic path", it is not the
ball that is accelerating. *Your* feet are in contact with the
Earth, you are accelerated.

Gone over to the Dark side, I see.

David A. Smith


.



Relevant Pages

  • Re: physics 101 - equivalence recap
    ... equivalence of gravity and acceleration. ...  No reponse posted to how a person in a gravitational field ... the accelerating person measures the rate of frequency change to be ... frame are equivalent only for local measurements. ...
    (sci.physics.relativity)
  • Re: The Twin Paradox explained from the moving twin ?
    ... events around him by *assuming* he is motionless in ... is to assume that freely falling frames are accelerating. ... Anyway, yes, someone motionless in a gravitational field sees freely falling frames as accelerating. ... Remember -- unless you already know this -- two identical experiments, one in a motionless frame in a gravitational field, and the other in an accelerating frame, have the same *results*, but gravity and acceleration do not have the same *effects* on the experiment. ...
    (sci.physics.relativity)
  • Re: Explaining Time Dilation
    ... :>:> about a force and gravity, you are not talking about GR. ... GR says there is no gravitation, only curved space; ... : to "accelerating in time". ... on the surface of the earth, it is attracted toward the center of the ...
    (sci.physics.relativity)
  • Re: Einsteins GR passes extreme test
    ... article) still refer to gravity as having a "tug". ... accelerating elevator car ... ... Objects that are freefalling (e.g., someone floating out in deep space ... yet not changing in velocity. ...
    (sci.electronics.design)
  • Meaning of gravity field debate - what is acceleration? Do we need curvature?
    ... Introduction to Einstein’s 1915 theory of gravity (General Relativity) ... What does it feel like to fall into the black hole? ... Does the dark energy accelerating our observable universe come from ...
    (sci.physics.relativity)

Loading