Chapter 4: Vectors In 1 dimension, we can specify direction with a or-sign In 2 or 3 dimensions, we need more than a sign to specify the direction of something To illustrate this, consider the position vector in 2 dimensions Example: Where is Boston? Choose origin at New York Boston Choose coordinate system Boston is 212 miles northeast of new york or New york Boston is 150 miles north and 150 miles east of new york Physics 121: Lecture 5, Pg 8Physics 121: Lecture 5, Pg 8 Chapter 4: Vectors In 1 dimension, we can specify direction with a + or - sign. In 2 or 3 dimensions, we need more than a sign to specify the direction of something: To illustrate this, consider the position vector r in 2 dimensions. Example: Where is Boston? Choose origin at New York Choose coordinate system Boston is 212 miles northeast of New York or Boston is 150 miles north and 150 miles east of New York Boston New York r