- #1
yoleven
- 78
- 1
Homework Statement
from the free body diagram of a block resting on a flat surface, I am trying to derive the coefficient of static friction.
Homework Equations
The Attempt at a Solution
I have the definition of the coefficient as:
us=Fn/Ffr
But in my free body diagram i am pulling on the block, which resists with the Ffr
I have
[tex]\Sigma[/tex]Fx=0
F-Ffrus=0
us=F/Ffr
My confusion is because if the definition of the coefficient is above, why don't I derive it when I observe my free body diagram of the block. What am I missing?
The forces in the x direction are my pulling force and the friction force that resists it * us
How do i get the weight of the block into my derived equation?