Physics Help: Calculating μ sub s and μ sub k

[ItsNoah]

Hi all, I just registered for this forum and I am excited to learn a lot! I am taking physics this year and I am enjoying it a lot although it is quite difficult for me.
Quick question:
how do I calculate μ sub s and μ sub k(formulas would be excellent)?
Thanks!

 

[Pengwuino]

If you're talking about the coefficients of friction for objects, they are typically determined by experiment.

 

[ItsNoah]

If you're talking about the coefficients of friction for objects, they are typically determined by experiment.

For example: A 95 kg clock initially a trest on a horizontal floor requires a 650N horizontal force to set it in motion. After the clock is in motion, a horitzontal force of 560N keeps it moving with a constant speed. Find μ sub k and μ sub s between the clock and the floor.

I said the μ sub s was < 650N and > 0 N would that be correct since static friction means it's not moving and if it's between 0 and 650 it will be staying at rest?