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a block resting on a table as mg force downward and normal force cancels that out.,so the block doesnot fall.That is newtons 3rd law.My question is if the downward force is mg how a force of mg upwards would be able to lift the block.

Shouldn't  it be greater than mg???Please explain.
asked Aug 31, 2014 in Mechanics by mogasatigopikrishna (200 points)

1 Answer

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Mg is downward force and if upward force equal to mg is applied then both the forces cancel out each other and net force on the body is zero. That is net acceleration of the body is zero. But it doesn't mean velocity is zero. The body will move with constant velocity. Hence, body moves.
answered Sep 13, 2017 by giginailo (2,580 points)