Conceptual Physics (12th Edition)

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

Chapter 9 - Think and Explain - Page 179-180: 71

Answer

Your weight equals mg when you are in static or dynamic equilibrium near the surface of the Earth, standing on a horizontal surface. The net force on you is zero. The 2 forces acting on you are mg, downward, and an equal and opposite support force, upward.
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