1. Oct 29, 2003 #1

   parthivsmehta

   

   A weight lifter weights 100 Kg and can lift 120 Kg of weight, so why can’t he carry himself and float in air for few seconds??

    

   Last edited by a moderator: Feb 7, 2013

   parthivsmehta, Oct 29, 2003
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3. Oct 29, 2003 #2

   Adrian Baker

   

   He can - it is called 'jumping'

    

   Adrian Baker, Oct 29, 2003
4. Oct 29, 2003 #3

   HallsofIvy

   

   Staff Emeritus

   Science Advisor

   Adrian Baker's answer was pretty good but I think what you are looking for is "for every action there there is an equal and opposite reaction". In order for a weight lifter to lift a weight, he has press down on the ground with an equal force- no ground, no force, no lift.

    

   HallsofIvy, Oct 29, 2003

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