A piano has a mass of 185 kg, and the coefficient of friction between it and the floor is 0.39. What is the maximum force of friction between the piano and the floor?

707 N

523 N

1813 N

1208 N

The mass of the piano is 185 kg, therefore its weight is

W = (185 kg) * (9.8 m/s²) = 1813 N

The normal reaction force on the piano from the floor is N = 1813 N, according to Newton's 3rd Law.

The coefficient of friction between the piano and the floor is given as μ = 0.39.

By definition, the frictional force is

F = μN

= 0.39*1813

= 707.07 N

Answer: 707 N