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2014-09-17T23:40:40+05:30

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If the first block is on a floor or a table, and the second block is kept on the first block, we have a total of 4 forces.

Normal reaction of floor or table on first block, weight of first block,
normal reaction of first block on second block and weight of second block.

between the two blocks at the surface of contact: two forces.
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