# An object with a mass of #4 kg# is lying still on a surface and is compressing a horizontal spring by #7/8 m#. If the spring's constant is #16 (kg)/s^2#, what is the minimum value of the surface's coefficient of static friction?

##### 1 Answer

Apr 28, 2016

#### Answer:

#### Explanation:

The spring applies a force of

Now the force of friction on the object =

so, if it is not moving, net force on the body must be zero,

hence: