Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 5 - Force and Motion-I - Questions: 5b

Answer

Situation 2 and 4 can result in the block moving at a constant velocity.

Work Step by Step

To move at a constant velocity, a moving object must experience either no force or equal and opposite forces (this prevents acceleration). Block 2 experiences two forces that are acting opposite of each other, so with equal magnitudes the moving block will travel at a constant speed. Block 4 experiences 3 forces, however, the resultant force of F3 and F2 acts directly opposite of F1 so, with equal magnitudes, block 4 can travel at a constant velocity. Blocks 1 and 3 experience forces that are not opposite, so no magnitudes of force can produce a constant velocity.
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