Physics - I need help ranking these magnitude of forces - Newtons 3rd Law?

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beautifulmeow85

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Three blocks are stacked on top of each other inside an elevator . Block 3 is 3kg and is ontop of block 2, of 2kg and those are on top of block 1, of 1kg.

With reference to the eight forces defined as follows, rank the magnirtude of forces from largest to smallest.

the force of the 3 block on the 2 block, ,
the force of the 2 block on the 3 block, ,
the force of the 3 block on the 1 block, ,
the force of the 1 block on the 3 block, ,
the force of the 2 block on the 1 block, ,
the force of the 1 block on the 2 block, ,
the force of the 1 block on the floor, , and
the force of the floor on the 1 block, .

Thanks for any help!!! how do you tell the mag of the force? by the length of the arrow in the fbd?
 
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