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213_Physics ProblemsTechnical Physics

213_Physics ProblemsTechnical Physics - 8 Potential Energy...

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8 CHAPTER OUTLINE 8.1 Potential Energy of a System 8.2 The Isolated System—Conservation of Mechanical Energy 8.3 Conservative and Nonconservative Forces 8.4 Changes in Mechanical Energy for Nonconservative Forces 8.5 Relationship Between Conservative Forces and Potential Energy Equilibrium of a System 8.6 Energy Diagrams and the Potential Energy ANSWERS TO QUESTIONS Q8.1 The final speed of the children will not depend on the slide length or the presence of bumps if there is no friction. If there is friction, a longer slide will result in a lower final speed. Bumps will have the same effect as they effectively lengthen the distance over which friction can do work, to decrease the total mechanical energy of the children. Q8.2 Total energy is the sum of kinetic and potential energies. Potential energy can be negative, so the sum of kinetic plus potential can also be negative. Q8.3 Both agree on the change in potential energy, and the kinetic energy. They may disagree on the value of gravitational potential energy, depending on their choice of a zero point.
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