A0.60 kg book slides on a horizontal table. The kinetic friction force on the book has magnitude 14 N. T Part A How much work is done on the book by friction during a displacement of 3.8 m to the left? Express your answer with the appropriate units. HÅ → aww ? W₁ = Value Units Submit Previous Answers Request Answer X Incorrect; Try Again Part B. The book now slides 3.8 m to the right, returning to its starting point. During this second 3.8 m displacement, how much work is done on the book by friction? Express your answer with the appropriate units. O μA www. ? Pearson

Question 2 Choose the statement about work which is incorrect: OA force perpendicular to displacement does no work. O A force that does no work cannot change the energy of an object. O All of the other options are correct. O A force that does no work can move an object a distance of 2 meters.

Review I A system in which only one particle can move has the potential energy shown in (Figure 1) . Suppose U1 = 88 J. Part A What is the y-component of the force on the particle at y = 0.5 m ? Express your answer to two significant figures and include the appropriate units. µA ? Fy = Value Units Submit Request Answer Part B Figure 1 of 1 What is the y-component of the force on the particle at y = 4 m? Express your answer to two significant figures and include the appropriate units. U (J) U HÀ ? Fy Value Units Submit Request Answer У (m) 5 0 - 1 3 4 Provide Feedback

A A parent pulls a child in a wagon at a constant speed, exerting a force of F = 55N at an angle of 30° with respect to the horizontal sidewalk. (a) How much work do they do, if they pull the wagon for a distance of 30m? (b) What is the force of friction on the wagon?