# Work done by friction

1. Jun 12, 2007

### kiwikahuna

1. The problem statement, all variables and given/known data

A flight attendant pulls her 60.4 flight bag
a distance of 323 m along a level airport floor
at a constant velocity. The force she exerts is
46.0 N at an angle of 61.3° above the horizon-
tal.
a) Find the work she does on the flight bag.
b) Find the work done by the force of friction
on the flight bag. Answer in units of J.
c) Find the coefficient of kinetic friction be-
tween the flight bag and the floor.

2. Relevant equations
force of friction = normal force X coeffiecent of kinetic friction

3. The attempt at a solution

I have found that the work she does on the flight bag is 7135.16 J and the work done by the force of friction is -7135.16 J.
I can't seem to comprehend how to solve for the coefficient. If you can lend a hand in the right direction, I would appreciate it very much!

2. Jun 12, 2007

### Staff: Mentor

That's what you need. Figure out the friction force (you must have figured that one out already) and the normal force.