What the book says: Displacement is the shortest distance between two points, and can be positive or negative. Question: What about when you're working with two axes? To find the point you use the pythagorean theorem... making displacement always positive. Is this related to magnitude? Distance is...? I know that it measures every step between two points (not the shortest distance like displacement), but as for sign, I'm guessing that it is always positive because Speed = Distance/ Time and Speed is always positive.