# An object with a mass of #1# #kg# is lying still on a surface and is compressing a horizontal spring by #1/4# #m#. If the spring's constant is #3# #kgs^-2#, what is the minimum value of the surface's coefficient of static friction?

##### 1 Answer

Jul 4, 2016

The force exerted by the spring is

The frictional force is given by

The frictional force must be at least equal to the spring force, so: