A 1.0kg box is on top of a 2.0kg box. A force of 6N is applied to the 2.0kg box so that both boxes slide together. There is no friction between the horizontal ground and the boxes but there is enough friction between the 2 boxes that the top of the box does not fall off but the bottom box slides with it. a) find acceleration of the boxes as they slide b) how much friction acts on the 1kg box from the top surface of the 2.0kg box on which it slides ?

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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!