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1 pound of force measure the deflection of a standard spring. 1 lb
accelerates a certain mass with an acceleration of 1 ft/s^2; we call
that amount of mass 1 slug.
On Nov 20, 2006, at 5:54 PM, Jack Uretsky wrote:Regards,
But there is no "k" needed. In what my 1940 text calls the static
systim,
1 pound of force measure the deflection of a standard spring. 1 lb
accelerates a certain mass with an acceleration of 1 ft/s^2; we call
that
amount of mass 1 slug. 1 slug has a weight of ~32 ft/s^2. G has a
value
of about3.5x10^{-8}#(ft/slug)^2. F=ma in ordinary English units, no
"k"
needed.
This defines 1 lb in terms of acceleration in free fall. The situation
would be very different if the standard spring, and the defining
deflection, were specified instead of 32 ft/s^2.
Ludwik Kowalski
Let the perfect not be the enemy of the good.
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