Caitlyn decides to test her strength to see if she is as strong as she was when winning Olympic gold medals decades earlier.  A 6-kg block of mass rests between the floor and a 3-kg block as shown in the figure. The 3-kg block is tied to a wall by a horizontal rope. If the coefficient of static friction is 0.8 between each pair of surfaces in contact, what force must Caitlyn apply horizontally to the 6-kg block to make it move?

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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!