Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 7 - Work and Kinetic Energy - Conceptual Questions - Page 210: 7

Answer

Please see the work below.

Work Step by Step

When we walk on ground, the frictional force between our shoes and the ground causes positive work to be done as we move forward. If there was no friction (e.g. on ice or in space), we would not be able to move forward -- it is the frictional force that helps us to move forward as we push back with our feet.
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