Calculate the coefficient of friction of a 12kg object that has a force of friction of 3N

0.026

Explanation:

The force of friction acts in the direction perpendicular to the norm force of the surface on which the object rests, induced by gravity. The magnitude of the friction force is

(Friction) = (mass) x (gravitational acceleration g) x (coefficient of friction)

from which the coefficient of friction can be determined:

(coefficient of friction) = (Friction) / ((mass) x (g)) = 3 N / (12 kg * 9.8 m/s^2) = 0.026