Physics Work Problem?

Question

2. A flight attendant pulls her 70 N flight bag a distance of 253 m along a level airport floor at a constant velocity. The force she exerts is 40 N at an angle of 52 above the horizontal. Find the following:
a. The work she does on the flight bag
b. The work done by the force of friction on the flight bag
c. The coefficient of kinetic friction between the flight bag and the floor.

Please show work and explain to me how to do it. Thank you.

Answer 1

a) Wor equal to parallel to motion force times the distance.
W= F s cos(52)
W=40 x 253 x cos(52)
W=6230 J

b) Similarly
W= f s=F s cos(52) ; f = F cos(52)
W=6230 J

c) f=u N
u= f/N= F cos(52)/w= 40 x cos(52)/70
u=.35

Answer 2

b) would technically be -6230 J since the force of friction is 180 degrees from the direction of motion.

Answer 3

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