Hi,Gene wrote to me to explain that body mass and weight are two different measures. So a revision of the "general info about metric measures for body mass and height" [USMA:40528] is in order. A few more words can extend the descriptiveness and yet remain minimal:
----- begin revision -------Metric units are practical and suitable for everyday measures of body mass (oftentimes inferred by a measure of weight on a scale*) and height.
*Mass is oftentimes referenced by a measure of weight on a scale, however 'weight' is more specifically the product of a force such as gravity that bears on a mass. In a frame of reference other than the surface of the earth, such as the surface of the moon; the same body mass would experience a weight or force of gravity that is only about 1/6 the gravity on the earth.
----- end revision ------- I also like the example that Gene wrote. On 2008 Mar 12 Wed DoY 072, at 09:26, <[EMAIL PROTECTED]> wrote:
A person of 60 kilograms body mass has a weight of about 600 newtons on the surface of the earth.That same person has the same body mass of 60 kilograms on the surface of the moon, but a weight of only 100 newtons on the surface of the moon where the acceleration of gravity is only 1/6 its value on the surface of the earth.All the above is by Newton's Second Law:"weight" is mass times the *local* acceleration of gravity in a specified (or implied) frame of reference, 9.8 meters per second squared on the surface of the earth with respect to the earth.
And I will try to add a number of 'practical calculation' tips that i have gathered since the first draft.
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Ron Stone
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