Question

HELP!!!!!!!!!!!! PLEASE!!!!!

The diagram shows a 15-kg box resting on a wedge which has an angle of inclination of 30° and a coefficient of friction of 0.15. Which equation correctly gives the value of Ff, the force due to friction?
A) Ff = 0.15FN
B) Ff = 0.15Fg
C) Ff = 0.15F||
D) Ff = 0.15F||F⊥

Answer 1

0.20 is correct. Ff= mgμFn. Therefore, μFn = Ff/mg= 49.05N/(25 kg)(9.81 m/s2)= 0.20

Answer 2

The friction force is given by the product of the normal force and the coefficient of friction.  So A is the correct answer