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 For every action force, there is an equal and opposite reaction force.
Can't change that.
If you jump up in the air, pushing off from the earth, you move up AND
the earth moves away from you in the opposite direction.  Now certainly
the earth's movement is infinitesimal, but it's non-zero.
You have to apply that to your Suburban analogy. Yes the dog will slow it
down. just not much. However, your analogy is flawed. Remember the
falling floors aren't hitting a dog. They are hitting another large mass
in the building below. A building designed to support the weight of all
the floors above and their contents plus a fair safety margin. And all
that building below is connected to the bedrock of the earth. Certainly a
large mass. This would be why something has to break instead of all of it
just passing the force on through the building.
At best, I think a more accurate version of your analogy would be running
your Suburban into your Tahoe, not your dog. Actually, it'd be more like
running your suburban into a line of Tahoe's, parked nose to nose and
expecting to crush through all of them to the last one without slowing
down much. Pretty ridiculous. But very much equivalent to the official
explanations.


  ----- Original Message -----
  From: "Mike Reid"
  To: "'Microcontroller discussion list - Public.'"
  Subject: RE: [OT] Physics denies official 9/11 report.
  Date: Wed, 6 Dec 2006 08:08:51 -0700


  This has been an interesting discussion, but the sheer magnitude of
  what
  happened is amazing. If I'm driving my Suburban at 60 miles per hour,
  and I hit a small dog, is that going to slow my vehicle down? 8000
  lbs
  times 60 miles per hour equals a force of 480,000 lbs hitting the
  dog.
  Even if I hit a deer at that speed, yes it will damage my vehicle,
  but
  will it slow me down much? The twin towers were hit at different
  floor
  levels, but when they fell, there was incredible weight above the
  impact
  zone. Once they started falling, this mass probably encountered
  little
  resistance below. That is obviously why they fell so fast. How much
  conservation of momentum can there be when millions of pounds are
  falling on top of each floor?
  Look at the fact that many of the victims were never found, just
  pulverized into powder. That shows why type of forces were involved.

  This is like a person stepping on a bug. The bug gets squished
  instantaneously and doesn't slow the person down...

  -----Original Message-----
  From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
  Behalf
  Of David VanHorn
  Sent: Wednesday, December 06, 2006 7:07 AM
  To: Microcontroller discussion list - Public.
  Subject: Re: [OT] Physics denies official 9/11 report.

  On 12/6/06, tachyon_1@email.com wrote:
  >
  > You've got that backwards. Each floor falling, crushes the floor
  below,
  > which initially IS at rest (stopped)
  > and has to accelerate from a stop. It's not like it can magically
  go
  from
  > standstill to the speed of the impacting
  > floor in zero time.



  Correct, but only the first part has to accelerate with only gravity.
  The rest have a shitload of moving mass slamming into them, and so
  they
  come
  up to speed much quicker.
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