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# Thread: Physic Brahs, need help for reps.

1. ## Physic Brahs, need help for reps.

Need the misc's help for this physics question, serious.

1. A box of books weighing 325N moves at a constant velocity across the floor when the box is pushed with a force of 425N exerted downward at an angle of 35.2 degrees below the horizontal. Find mu sub k between the box and the floor.

2. Originally Posted by BobbyDole23
Need the misc's help for this physics question, serious.

1. A box of books weighing 325N moves at a constant velocity across the floor when the box is pushed with a force of 425N exerted downward at an angle of 35.2 degrees below the horizontal. Find mu sub k between the box and the floor.
Normal Force = Fn = 325 N
Applied Force = 425 N
X is horizontal axis
Y is Vertical Axis
Projected applied Forces:
Fx = 425 cos(35.2)
Fy = 425 sin(35.2)

Frictional Force = Fk = (Fy+Fn)*uK
Const Velocity when Fk = Fx

ie: Fx = (Fy+Fn)*uk
uk = Fx/(Fy+Fn)
uk = 425cos(35.2)/(425sin(35.2)+325)
uk = .6093

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