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akash kashyp Grade: Upto college level
        

a varing horizontal force  f=at acts om block of mass m kept on smooth horizontal surface . an identical block is kept on the first block.the co efficient of firction between the blocks is k.the time after which the relative sliding between the blocks prevails is?(a is constant)

7 years ago

Answers : (2)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear akash


Sliding prevail when horizontal force will increse the maximum static friction force between the blcock


at>kmg


t>kmg/a


so for limiting case


t=kmg/a


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Badiuddin

7 years ago
RAJEEV CHOUDHARY
9 Points
										

Force Equs for 2 blocks are:


     at - f  =  mA                        (1)


           f  =  mA                        (2)


A is the acc. of 2 blocks before relative sliding.Solving above eqs. we get


     f  =  at/2


Now when relative sliding starts then


     f =  Nk  =  mgk


     at  =  mgk


or   t  =   2mgk/a

7 years ago
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