Hi Ken,
G-force is a comparison of what an object would weigh "if" it were subjected
to a gravitational pull that is X amount greater than what you feel on
earth.
In other words, when you are standing in the elevator waiting for the door
to close, everything is normal and you feel one (1) G-force. When the
elevator starts to move up, you feel a little heavier as if you either
suddenly gained a lot of weight, or the earth's gravity just got a lot
stronger. That is an increase in G-force.
You will then notice that after the elevator is moving, everything feels
normal again. You are now back to one (1) G-force.
The increase in G-force is due to the acceleration of the elevator from
speed 0 ft per second to 2 ft per second.
Depending on how much time it takes for the elevator to go from speed 0 ft
per second to 2 ft per second will depend on how heavy you will feel while
it gets up to speed. The faster it gets up to speed, the heavier you will
feel.
Notice that it doesn't matter what floor you start from. Whenever the
elevator goes up, you feel a little heavier at the start of the movement and
no longer feel heavier after the elevator gets up to a constant speed.
So height does not matter, only how long it take to go from one speed to the
next speed.
Imagine now that you are in this elevator one floor up from the basement and
the cable breaks. You suddenly drop and get up to a certain speed just
before hitting the bottom. You can imagine that when you hit the ground,
you would feel so heavy that your legs would not be able to hold you up.
You would have just experienced a really big G-force.
For an airplane doing 550 miles per hour and suddenly stopping in just a few
seconds or less, the G-forces would be even bigger than the elevator
example. The only two things that matter is the time it takes to stop, and
how fast it was going before slowing down.
I hope this helps
Kind Regards
Ryan Grant
Advanced Technology Engineer
MCMS
(208) 898-1145
[log in to unmask]
> -----Original Message-----
> From: Ken Patel [SMTP:[log in to unmask]]
> Sent: Wednesday, October 10, 2001 4:29 PM
> To: [log in to unmask]
> Subject: Re: [TN] Question for the physics "gurus"
>
> All,
> If G force is the gravitation force acting on the object then why many
> times an object is
> being designed to take so may G forces. What I have heard that voice
> recorder of the plane
> that went down in Pennsylvania can take on 700G force! So, if the free
> fall is 1 G then why
> design 700 times safer. So, height above the ground does matter. May be I
> got to take a look
> at the physic's book unless someone explain in layman's term.
>
> re,
> Ken Patel
>
>
> Timothy Reeves wrote:
>
> > No Jason,
> > I am not a guru, but that's OK. They are not interconvertible. One is a
> > measure of force, the other acceleration (actually a dimensionless
> > multiplier of the standard gravitational acceleration, g, 9.8 m/s^2). If
> you
> > have an object in mind of a known mass, you could find the force exerted
> on
> > it given the acceleration ("G's") by F = m a.
> >
> > Example: 100 gram object subjected to 5 G's ---------> F = 0.1 kg * 5 *
> 9.8
> > m/s^2 = 4.9 Newtons or 0.5 kilogram force or 1.1 lb-force.
> >
> > Tim Reeves
> >
> > -----Original Message-----
> > From: Jason Gregory [mailto:[log in to unmask]]
> > Sent: Tuesday, October 09, 2001 9:01 AM
> > Subject: Question for the physics "gurus"
> >
> > How do you convert pound/kilogram to G-force? Is this convertable? Since
> > G-force is somewhat time derived and pound/kilogram is force derived?
> > Any help is appreciated.
> >
> > Jason Gregory
> > Software Specialist - NPI Group
> > SCI Systems/Plant 2
> > 13000 S. Memorial Pkwy.
> > Huntsville, AL. 35803
> > (256) 882-4107 x3728
> > [log in to unmask]
> >
> >
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