If two vectors are not continuous (like two forces pulling on an object), you must use the
parallelogram law of addition.
Here’s an example:
Two forces pull on an object with forces of 6 N north and 8 N east. What is the resultant force and
direction?
By treating the forces like sides of a parallelogram, you can find the resultant force.
REGRESSION
Some questions on Test Day might involve scatterplots and regression. In order to interpret a
scatterplot, you may need to make a guess about the correlation coefficient, which determines how
closely the data points tend to come to the line. The closer that the absolute value of the correlation
coefficient is to 1, the stronger the regression line is.
Scatterplots with a linear regression demonstrate a constant increase or decrease in values. In other
words, the line that best fits the data will be a straight line, and its equation will be in the familiar
form y = mx + b.