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{{essay|design|Nomological machine|}}:“It is a fixed (enough) arrangement of components, or factors, with stable (enough) capacities that in the right sort of stable (enough) environment will, with repeated operation, give rise to the kind of regular behavior that we represent in our scientific laws” <ref>{{author|Nancy Cartwright}}. {{br|The Dappled World – A Study of the Boundaries of Science}}. (Cambridge University Press, 1999)</ref>
{{essay|design|Nomological machine|}}
 
I think this is fancy way of saying it’s a [[model]]. So, for example take [[Newton’s laws of motion|Newton’s second law of motion]], which describes the relationship between an object's mass and the amount of force needed to accelerate it.
 
This is stated as ''F=ma'' which means the ''force'' (F) acting on an object is equal to the ''mass'' (m) of an object times its [[acceleration]] (a).
 
This is an immutable law of physics which holds in all non-relativistic, non-quantum scales. But the conditions in which it operates — zero friction, perfect elasticity, non-intertial frame of reference — circumstances which never exist in real life. So  a rolling ball with no force acting upon it will eventually stop. A [[crisp packet|crisp packet blowing across St. Mark’s square]] still does obey Newton’s laws of motion — once you have discounted all the contaminating effects of the real world, such as friction, convection and so on — but good luck calculating its trajectory using them in any case.
 
{{sa}}
*[[The map and the territory]]
*[[Policy]]
*[[Root cause analysis]]
*[[Meatware]]
*[[In God we trust|In God we trust, all others must bring data]]
 
{{ref}}
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