SOLUTION: What is the friction force on a Box that has a mass of 15 kg as it slides across the floor. The coefficient of friction of the not so clean floor is 0.25
Friction force is the product of the weight of the box by the coefficient of friction.
The weight is m*g = 15 kg * 10 m/s^2 = 150 newtons;
the friction force is 150 newtons * 0.25 = 37.5 newtons. ANSWER