I heard about a new thing today called tribolgy. And though it calls certain images to mind it has nothing to do with Africans or Native Americans or the like. Though the roots maybe as deep. Wikipedia says “Tribology is the science and technology of interacting surfaces in relative motion. It includes the study and application of the principles of friction, lubrication and wear. The word "tribology" derives from the Greek τριβο ("tribo") meaning 'to rub', and λόγος ("logos") meaning 'principle or logic'.”
Basically what it comes down to is that when 2 materials pass each other 1 should be soft and the other hard. It doesn’t necessarily matter which is which, but if they are the same the materials will seize and bind. While little of we do is intense engineering or highly critical, it is something to keep in mind.