The masses of the boxes are mA=15 kg and mB=60 kg. The coefficient of static friction between boxes A and B and between box B and the inclined surface is 0.12 Determine: a. total weight of the boxes b. what is the largest force F for which the boxes will not slip? (the block B impends upward to the incline) c. what is the smallest force F for which the boxes will not slip? (the block B impends downward to the incline)

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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!