A block of mass 'm' is kept on the ground as shown in figure.
(i) Draw F.B.D. of block
(ii) Are forces acting on block action -reaction pair
(iii) If answer is no, draw action reaction pair.

Explanation

(i) F.B.D. of block

(ii) 'N' and Mg are not action-reaction pair. Since pair act on different bodies, and they are of same nature.
(iii) Pair of 'mg' of block acts on earth in opposite direction.

and pair of 'N' acts on surface as shown infigure.