A 140-kg crate is pushed along a level floor at a constant speed of 0.22 m/s. If the coefficient of kinetic friction is 0.36, the force of friction between the crate and the floor is most nearly...

Question

A 140-kg crate is pushed along a level floor at a constant speed of 0.22 m/s. If the coefficient of kinetic friction is 0.36, the force of friction between the crate and the floor is most nearly..

A) 50 N

B) 490 N

C) 300 N

D) 110 N

 

Answer 1

m = 140 kg

v = .22 m/s

a = 0 m/s²

μ_k = .36

F_f = = μ_kN = μ_kmg = .36 (140 kg) (9.81 m/s²) = 494.424 N