provious 11 of 14 ne Problem 7.07 Part B A factory worker moves a 30.0 kg crate

Question

provious 11 of 14 ne Problem 7.07 Part B A factory worker moves a 30.0 kg crate a distance of How much work is done on the crate by the worker's push? 5.40 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.250 Submit Incorrect; Try Again; 16 attempts remaining Part C How much work is done on the crate by friction? friction = Submit My Answers Give Up Incorrect; Try Again; 18 attempts remaining Part D How much work is done by the normal force?

Explanation / Answer

Perpendicular to the incline,

N - m g = 0

N = m g

f = uk m g

along the incline,

F - f = 0

F = uk m g

(B) W = F d

= (uk m g ) (d)

= 0.250 x 30 x 9.8 x 5.40

= 396.9 J

(c) Work done by friction = - uk m g d

= - 396.9 J

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