a body is lying on a table . Forces acting on it are 'mg' downwards and normal reaction 'n' uppwards . why do these forces not form action reaction pair ?
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Explanation:
Sir Newton's third law of motion states that for an action there is always an equal and opposite reaction . These two forces always act on different objects . When a book is kept on a table , weight (gravitational force) of book acts on table vertically downwards and as a reaction of weight , table also exerts an equal and opposite ( upward) force on book .
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