To measure the static friction coefficient between a 1.64-kg block and a vertical wall, the setup shown in the drawing below is used. (The dots are only there because spaces didn't work)
A spring (spring constant = 500 N/m) is attached to the block. Someone pushes on the end of the spring in a direction perpendicular to the wall until the block does not slip downward. The spring is compressed by 0.0400 m. What is the coefficient of static friction?
K = 500n/m
m = 1.64kg
x = 0.0400m
I know that the force by the spring pressing against the block is 20N since i used F =kx
I also know that the force of gravity is 16.1N
The Attempt at a Solution
I've attempted finding force by the spring on the block = 20N
Force of gravity = 16.1N
then subbing the two in.
Ff = µFn
20 = µ(16.1)
µ = 1.24
But that's not the right answer.
Doesn't it only matter with the forces in the direction of motion?
so since the block would be falling, how does the spring come into play?
I'm kind of confused