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Explanation: You are right, Scott, “nugget” is a noun. The question we normally ask, however, is: How do you intend to use this noun in a sentence?
The American Heritage Dictionary defines “nugget” as “a small, solid lump” or “a small compact portion or unit.” Here in Texas, we use it for describing tiny bits of fried chicken, lumps of gold, or even hard stools (I work in a clinical environment).
This term is appropriate for a lump of gold, especially in a literary context using a high register. There is a famous book called SHATHARAT AL-THAHAB, written by Ibn Al-Imad Al-Hanbali
شَـذَرات الذَهَب لابن العماد الحنبليّ
I see that you have designated the field as “literary/artistic.” SHATHRA is suitable for that kind of context, and is actually better known in its plural form (mainly due to the aforementioned book). It is not suitable for such mundane applications as describing fried chicken or hard stools. For these I would use KURAYYA, diminutive form of KURA كُرَيّة، تَصغير كُرة
I am not really sure what you mean by "static friction" and "rolling friction".
By definition, friction is the resistance to force and movement due to the "frictional" force between two surfaces in contact with each other. The relational value of this phenomenon is referred to as "coeffecient of friction".
The value of friction (a force) is dependent on the nature of the two surfaces in contact (the COF) and the force with which these surfaces are pressed against each other.