I've forgotten what the original question was but I think we are getting
confused between metric and imperial measures. Just for the record:
In SI units (which we should all be using!!!),
Mass = Kg
Force = Newton
In old Imperial Units:
Mass = Pound or Ounce
Force = Pound-Force or Ounce-Force
See web site: http://physics.nist.gov/cuu/Units/units.html for a full list
of SI units.
I've just re-read the original question and the answer is no, you can't
convert Kg or Ib to G force. G Force is dependant on the Mass. e.g. the
force exerted on a racing drivers neck as he turns a corner will increase if
his helmet is heavier. i.e. Mass (Kg) x Acceleration (M/s^2).
1G is equal to the force applied by the earth's gravity i.e. the force on a
given mass due to an acceleration of 9.8M/S^2.
I am not a physicist so if any of the above is incorrect I am sure someone
will tell me.
But please lets stick to one system of measure (preferably SI units).
Neil
-----Original Message-----
From: Lou Hart [mailto:[log in to unmask]]
Sent: 09 October 2001 21:51
Subject: Re: Question for the physics "gurus"
Jason sure has gotten a lot of feedback on this question. I have these
comments.
Pound/kilogram is, in principle, acceleration, since the pound is a unit of
force, and force divided by mass is acceleration. According to a
conversion calculator a colleague gave me, 1 pound (force) is 4.448222
newtons. Since G= (approximately) 9.8 m/sec^2 (meters per second
squared), it looks like (pound/kilogram) x 2 = G (approximately, as
acceleration).
Jason refers to G force. Mass x G = force (weight) as several have pointed
out. A body's mass has a force (weight) applied to it when accelerated.
I wonder if something is left out of the question - are these some kind of
shorthand units? For example, in referring to flight, people talk about G
force - since a pilot's mass does not change, acceleration will effectively
add to weight force on the body. No matter the mass of the pilot's body,
the multiplier increasing the force on it above that on the earth's surface
is the acceleration (commonly expressing in "G"s). My favorite example of
a shorthand unit is wave number, the number of wavelengths of radiation in
1 centimeter. I believe it is most commonly used in infrared spectroscopy
as a unit of energy. "Inverse centimeters" seems far removed from energy,
but is equivalent if you understand the shorthand involved and multiply
wavenumber by Planck's constant and again by the speed of light.
I look forward to the day when "pounds" and "inches" are as commonly used
in mechanics as "statcoulombs" and "abamps" now are in electricity and
magnetism. Lou Hart
-----Original Message-----
From: <Rudy Sedlak> [SMTP:[log in to unmask]]
Sent: Tuesday, October 09, 2001 2:42 PM
To: [log in to unmask]
Subject: Re: [TN] Question for the physics "gurus"
1 "G" = 32 feet/second/second
don't think you can convert kilos to feet/second/second
Rudy Sedlak
RD Chemical Company
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