Three identical 2.0 kg blocks are stacked on top of one another, three blocks tall.  They sit on the floor of a moving express elevator (it is accelerating down), and nothing else is touching them.  If the normal force of the floor on the bottom most block is of magnitude 54 N, what is the magnitude of the force on the top block due to the middle block? a) 16 N b) 17 N c) 18 N d) 19 N e) 20 N

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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!