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Physics For Scientists & Engineers
Found in: Page 211
Physics For Scientists & Engineers

Physics For Scientists & Engineers

Book edition 9th Edition
Author(s) Raymond A. Serway, John W. Jewett
Pages 1624 pages
ISBN 9781133947271

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Short Answer

In Chapter 7, the work–kinetic energy theorem, W=DK, was introduced. This equation states that work done on a system appears as a change in kinetic energy. It is a special-case equation, valid if there are no changes in any other type of energy such as potential or internal. Give two or three examples in which work is done on a system but the change in energy of the system is not a change in kinetic energy.

The change in energy due to work done in heat engines is not a change in kinetic energy of system and the change in energy due to work done for an object moving in uniform circular motion on a circular path is not a change in kinetic energy are two examples in which change in energy due to work done is not a change in kinetic energy.

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Step by Step Solution

TABLE OF CONTENTS :
TABLE OF CONTENTS

Step 1: Determine the first example for work done on a system such that change in energy is not a change in kinetic energy

When work is done on the piston of the heat engines then fuel is compressed in engine due to change in pressure and temperature. The change in pressure and temperature changes either the heat of system or internal energy of system.

This transfer of work to system changes the energy of system but the change in energy of system is not a change in kinetic energy.

Therefore, the change in energy due to work done in heat engines is not a change in kinetic energy of system.

Step 2: Determine the second example for work done on a system such that change in energy is not a change in kinetic energy

The object moving on a circular path with uniform circular motion consists the same kinetic energy for all positions on circular path but the potential energy of the object on circular path changes with position of object.

The change in the potential energy of object is due to the work done on the object. The kinetic energy is constant so change in energy due to work done is not a change in kinetic energy.

Therefore, the change in energy due to work done for an object moving in uniform circular motion on a circular path is not a change in kinetic energy..

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