It's a metaphor. Not literally a physics or math statement. In the system where most people operate most of the time, there's friction between all moving part

It's a metaphor. Not literally a physics or math statement. In the system where most people operate most of the time, there's friction between all moving parts. Likewise, in the person-realm, every choice or action has an opportunity cost. "No such thing as a free lunch." You can tell it's a metaphor and not a literal mathematical statement because it's not written in TeX /s