Conceptual Physics (12th Edition)

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

Chapter 4 - Think and Explain - Page 71-72: 78

Answer

Acceleration is the ratio of net force to mass (by Newton’s second law). For an object in free fall, the net force is weight, so the acceleration is weight/mass = mg/m = g, which is equal for all masses. In other words, the greater gravitational force on the more massive object is exactly matched by that mass's greater inertia, so all objects in free fall accelerate at the same rate, g.
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