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324    Chapter 7  Conservation of Energy and an Introduction to Energy and Work



                         (b)   Explain why the work done by the exter-      (c)   Design procedures to collect and analyze data to test
                        nal force on the springs attached in series          the claim in part (a). Include a careful description of
                        is the sum of work done on each of the               methods to be used to measure length.
                        springs.
                       You are provided with several weights with
                     known mass, a ruler, and several identical
                     springs with unknown spring constant that
                     can be connected end-to-end, as shown.















                         WHAT DID YOU LEARN?

                                                                                                        Prep for the
                                                                                                            Exam
                                                                                                        AP
                                                                                                          ®
                                                                                                      Relevant section
                   Chapter learning goals                          Section(s)       Related example(s)  review exercises
                     Explain what it means for a quantity to be conserved.    7-1     7-1                1
                                                                      7-2
                     Describe what conditions must be met for work to be done on an    7-2    7-1, 7-2    1, 3
                   object, for both positive and negative work.
                     Explain the relationship between work and kinetic energy for an object.    7-3    7-3     2, 3, 6
                     Explain why something modeled as an object can have only kinetic    7-4    7-4       2, 3, 4
                   energy, and why a system can have other types of energy.
                     Describe how the work-energy theorem relates to conservation of    7-5    7-6, 7-7     3, 5, 7
                   energy for an object or a system.
                     Explain the meaning of potential energy and how conservative    7-6    7-8          2, 5
                   interactions, such as those described by the gravitational and
                   spring forces, give rise to potential energy.
                     Recognize why the work-energy theorem applies even for curved    7-5    7-6, 7-7     1, 2, 3, 7
                   paths and varying forces such as the spring force.





                       Chapter 7 Review




                        Key Terms



                       All the Key Terms can be found in the Glossary/Glosario on  page G1  in the back of the book.


                     closed, isolated system   287        internal energy   289            spring potential energy   322
                    conservation   286                  joule   290                        translational kinetic energy   300
                    conservation law   287              kinetic energy   288               work   287
                    conservative force   316            law of conservation of energy   287        work-energy theorem   298
                    energy   287                        nonconservative force   316
                    gravitational potential energy   318        potential energy   288

                            Uncorrected proofs have been used in this sample. Copyright © Bedford, Freeman & Worth Publishers.
                            Distributed by Bedford, Freeman & Worth Publishers. For review purposes only. Not for redistribution.

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