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Unformatted text preview: Worksheet 8: Work and Kinetic Energy Questions 1. No work is done because the displacement (horizontal) is perpendicular to the direc- tion of the force (vertical - gravity being the force). 2. W = vector F x , since the wall doesnt move the work is zero. 3. In this problem, there are two forces acting on the ball: you and the gravity. It turns out that the positive work you do is exactly cancelled out by the negative work gravity does on the ball, hence the net work is zero. 4. How does the work depend on different ways of lifting it? (a) Since gravity is a conservative force, the net work only depends on the initial and final heights- irrespective of path. (b) The duration of the lift does not affect the work done W = vector F x . (c) The height of the table does matter, increasing the height will increase the amount of work done W grav =- mgh . (d) The weight of the suitcase affects the work done....
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