why is calculated diff. from measured when using a lever?

Question

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Answer 1

Good question!
Grasshopper, it is not to know the answers but to understand the question.
But Master, I do not understand the question.

In general calculation theoreticaly has an infinite resolution while anything we measure has a finite resolution. For example if you are using a ruler of say 40cm divided into mm (400mm in this acse) then you can measure up to one mm in precision. So youcan say 50.0 cm or 500mm, but you can NOT say 50.00cm or 500.0 mm.
I hope it helps.