An object with a mass of #7 kg# is lying still on a surface and is compressing a horizontal spring by #5/4 m#. If the spring's constant is #4 (kg)/s^2#, what is the minimum value of the surface's coefficient of static friction?

1 Answer
Apr 15, 2017

Answer:

The coefficient of static friction is #=0.073#

Explanation:

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The force of compression is

#F=kx=4*5/4=5N#

The coefficient of kinetic friction is

#mu_s=F/N#

The normal force is #N=mg=(7g)N#

So,

#mu_s=5/(7g)=0.073#