could you explain the correct answer. Thanks in advance A small block rests on t

Question

could you explain the correct answer. Thanks in advance

A small block rests on top of a large block. Both blocks are accelerated to the right at the same rate by pushing on the bottom block as shown. Consider the three forces listed below: 1. The force of the finger pushing the block. 2. The force of static friction between the bottom block and the top block. 3. The force of kinetic friction between the bottom block and the top block. Which force(s) act on the small top block along the horizontal direction? A) 1 only B) 2 only C) 3 only D) 1 and 2 E) 1, 2, and 3

Explanation / Answer

3 only. Horizontally, the block has to overcome the static friction force and get used to the kinetic component to enable the movement of the small body caused due to the finger force.

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