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Answer» Very simple !!
having two LOGIC , see :-
Static friction help to oppose the motion (μs )
μk = kinetic friction
concept :- 1)
if external force is GREATER then static friction ( μs ) then body will move .
2 ) if μs < μk then the body will be accelerate .
3 ) if μs > μk then the body will not move ( remain at rest )
{ because static friction is more than kinetic friction }
now according to question :-
μs => 0.5
μk = .3
F = μs N ( mg )
=> 0.5 × 10× 10
=> 50N
see , that LHS force = 50N and RHS force = 51 N
so body will not will be in equilibrium , it STARTS moving towards right
we used 1 concept
hope it help you !!
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for calculation of accelerate we use μk
because body have to move.
hope it help you !!
if any doubt kindly ask me in comment section
so thanks and all the best !!
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