Conceptual Physics (12th Edition)

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

Chapter 5 - Think and Discuss: 79


It is true that the force that the horse exerts on the wagon (action) is equal and opposite to the force that the wagon exerts on the horse (reaction). However, because these two forces don't both act on the wagon, they do not cancel each other out. Only when forces act on the same body is it proper to add them to find the net force on the body. The horse should pull.
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