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Unformatted text preview: Chapter 10 Study Guide for Work 10.1 Force displacements Skill 10.1 Understand what conditions must hold if a force does work on a system. Definition of Work: Work is the change in total energy of a system due to external forces. To do work, the point of application of a force must undergo a displacement. If there is no motion, then no work is done regardless of how hard you push or pull. 10.2 Positive and negative work Skill 10.2 Be able to determine whether the work done by a force is positive or negative. If the applied force and the displacement of the point of application of that force point in the same direction, then the work done is considered to be positive . If they point in opposite directions, then the work done is considered to be negative . 10.3 Work-energy diagrams Skill 10.3 Be able to draw work-energy diagrams for various systems. Work-energy diagrams are tools that allow us to keep track of the changes in energy (and therefore the work done) due to the application of an external force. In order to construct a work-energy diagram, you can follow these steps: 1. Choose the system to be considered, and list the components inside the system. 2. Sketch the initial and final states of the system. 3. Determine any changes in the systems energy. Draw bars representing the changes in the various types of energy (kinetic, potential, source, dissipated). 4. Determine the work done on the system (it should be equal to the sum of the changes in energy found in step 3). Draw a bar representing the work done. 10.4 Choice of system Skill 10.4 Understand how the choice of system affects the changes in system energy and work done on the system. 1 When we change what we include in a system, we have to change the work-energy diagram. By looking at different system configurations for the same situation, we are often able to gain insight into the nature of the energy conversions and transfers that are taking place....
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