Principia: The Mathematical Principles of Natural Philosophy

by Isaac Newton

But as artificers do not work with perfect accuracy, it comes to pass that mechanics is so distinguished from geometry, that what is perfectly accurate is called geometrical , what is less so, is called mechanical.

Geometry does not teach us to draw these lines, but requires them to be drawn

An impressed force is an action exerted upon a body, in order to change its state, either of rest, or of moving uniformly forward in a right line.