# An object with a mass of #8 kg# is lying still on a surface and is compressing a horizontal spring by #5/4 m#. If the spring's constant is #3 (kg)/s^2#, what is the minimum value of the surface's coefficient of static friction?

##### 1 Answer

Dec 20, 2016

#### Answer:

The static coefficient must equal 0.048

#### Explanation:

We are looking at a case of balanced forces here. The force of the spring

Static friction will be equal in magnitude to this, as there is no motion.

Writing the force of friction as