if a magnet can attract heavy metal then why not heavy metal can attract a magnet(which has very less mass )

Dear Student, 

Magnet attract metals like iron, nickel and cobalt because magnet have magnetism which attract these metals towards it. If we talk about heavy metal and a small magnet, due to large mass heavy metal will not be going to attract towards the small magnet (due to inertia), to move this heavy metal piece we will need heavier magnet which can apply that much amount of force that is needed to attract the metal piece.
And if we place a heavy metal and a small magnet together, the small magnet will easily moves toward the metal piece due to magnetism. 


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Why doesn't equal and opposite reaction work here even though the mass of metal is more then that of the magnet
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