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Physics II workshop_Part_43

Physics II workshop_Part_43 - 89 2 Friction Force Motion on...

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88 Conservative and Non-Conservative Forces 1. Force of gravity: Motion in a Vertical Plane Point A is at your feet, point B is 2 m vertically up and 1.5 m horizontally from the first point. Three paths between point A and point B are shown. You move a ball from A to B along each of the paths. The ball has a mass of 4.0 kg and is motionless at the start and at the end. (a) What is the net work done on the ball in each for each of the three paths? (b) Determine the work done by the force of gravity for Path 1. (c) Determine the work done by the force of gravity for Path 2. (d) Determine the work done by the force of gravity for the diagonal line, Path 3. (e) Are your answers the same or different for the three paths? (f) Does the work of gravity equal the net work? Why or why not?
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Unformatted text preview: 89 2. Friction Force: Motion on a Horizontal Plane Now consider the same diagram for a book on a horizontal table where there is a frictional force of 5 N on the book. B is located 2 m north and 1.5 m east of A. The book is at rest at the start and end of its motion. (a) What is the net work done on the book for each of the three paths? (b) Determine the work done by the force of friction for Path 1. (c) Determine the work done by the force of friction for Path 2. (d) Determine the work done by the force of friction for the diagonal line, Path 3 . (e) Are your answers the same or different for the three paths? (f) Does the work of friction equal the net work? Why or why not? Which of these forces is "Conservative" and which is "Non-Conservative"? Why?...
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