![]() We first consider a system with a single particle or object. ![]() Thus, there is no physical law of conservation of water. A conserved quantity, in the scientific sense, can be transformed, but not strictly created or destroyed. However, in scientific usage, a conserved quantity for a system stays constant, changes by a definite amount that is transferred to other systems, and/or is converted into other forms of that quantity. Bring these atoms together to form a molecule and you create water dissociate the atoms in such a molecule and you destroy water. Water is composed of molecules consisting of two atoms of hydrogen and one of oxygen. (The same comment is also true about the scientific and everyday uses of the word ‘work.’) In everyday usage, you could conserve water by not using it, or by using less of it, or by re-using it. The terms ‘conserved quantity’ and ‘conservation law’ have specific, scientific meanings in physics, which are different from the everyday meanings associated with the use of these words. The last section of this chapter provides a preview. As you continue to examine other topics in physics, in later chapters of this book, you will see how this conservation law is generalized to encompass other types of energy and energy transfers. This will lead us to a discussion of the important principle of the conservation of mechanical energy. In this section, we elaborate and extend the result we derived in Potential Energy of a System, where we re-wrote the work-energy theorem in terms of the change in the kinetic and potential energies of a particle. Use the conservation of mechanical energy to calculate various properties of simple systems.Formulate the principle of conservation of mechanical energy, with or without the presence of non-conservative forces.Check with the seller before completing your purchase.By the end of this section, you will be able to: If purchasing or renting from companies other than Pearson, the access codes for the Mastering platform may not be included, may be incorrect, or may be previously redeemed. To register for and use MyLab or Mastering, you may also need a Course ID, which your instructor will provide. Several versions of the MyLab™ and Mastering™ platforms exist for each title, and registrations are not transferable. Before purchasing, check with your instructor to confirm the correct ISBN. By combining trusted author content with digital tools developed to engage students and emulate the office-hour experience, Mastering personalizes learning and improves results for each student. Modified Mastering™ is the teaching and learning platform that empowers you to reach every student. ![]() Not only does this make the material more interesting and easier to understand, but it is closer to the way physics is actually practiced. We then move on to the generalizations and more formal treatment of the topic. Physics is a description of reality, and thus each topic begins with concrete observations and experiences that students can directly relate to. It aims to explain physics in a readable and interesting manner that is accessible and clear, and to teach students by anticipating their needs and difficulties without oversimplifying. The new edition also features an unrivaled suite of media and on-line resources that enhance the understanding of physics. Physics for Scientists and Engineers combines outstanding pedagogy with a clear and direct narrative and applications that draw the student into the physics. This long-awaited and extensive revision maintains Giancoli's reputation for creating carefully crafted, highly accurate and precise physics texts. For the calculus-based General Physics course primarily taken by engineers and science majors (including physics majors).
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