Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 7 - Think and Discuss: 109

Answer

Your discussion partner is confused about "work being done" and "net work being done".

Work Step by Step

In pushing a block along a table at constant speed, your hand ("engine") does positive work, and friction does negative work. "Work is done", but the net/total work done is zero because the KE of the block stays the same. This is similar to saying that the net force (which is zero) does no work.
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