A 10 kg box is placed on one end of 1-m-long plank. The plank itself also has a mass of 10 kg. This arrangement is held in a horizontal position by two cables, as shown in the figure below. (a) Draw a free-body diagram for this system. (b) Find the cable tensions

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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!