A flight attendent pulls her 78.6 N flight bag a distance of 344 m along a level airport floor at a constant velocity. The force she exerts is 44.8 N at an angle of 64.2 degrees above the horizontal.

Question

A flight attendent pulls her 78.6 N flight bag a distance of 344 m along a level airport floor at a constant velocity.  The force she exerts is 44.8 N at an angle of 64.2 degrees above the horizontal.
Find the coefficient of kinetic friction between the flight bag and the floor?
Please furnish calculations.

drwls · Answer

The exerted force along the floor direction is 44.8 cos 64.2 = 19.5 N
That equals the bag's weight times the kinetic friction coefficient, Uk, since there is no acceleration.

19.5 = 78.6 Uk
Solve for Uk