The following picture shows a train of 4 blocks being pulled across a frictionless floor by a force. Answer the following: A. What total mass is accelerated to the right by a) force b) cord 3 c) cord 1. B. Rank the blocks according to their accelerations with the greatest being first and rank the cords from highest tension to lowest tension.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!