Three boxes of different masses are accelerated by a pushing force F along a frictionless floor. The small box B in the middle is fragile and will break if either of the other boxes pushes on it too much. The system is going to be accelerated to the right at 5 m/s MASS BOX A - 4KG  MASS BOX B - 2 KG MASS BOX C - 6KG In order to accelerate the system of boxes at 5 m/s2, what must the pushing force be? Using Newton’s 2nd and 3rd law, solve for the horizontal forces acting on box B:

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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!