ANSWER:
Coefficient of static friction
STEP-BY-STEP EXPLANATION:
We have that the force of friction is given by the coefficient of friction multiplied by the normal force, like this:
[tex]F_F=\mu F_N[/tex]We know that an equation of a straight line the slope is expressed as follows:
[tex]\begin{gathered} y=mx \\ \text{ m is the slope } \end{gathered}[/tex]Which means that the slope of the line between the relation of friction and normal force is the coefficient of static friction
