Physics-
General
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Question

When a force F is applied on a block of mass m resting on a horizontal surface then there are two possibilities, either block moves by translation or it moves by toppling. If the surface is smooth then the block always translates but on a rough surface it topples only when the torque of the applied force F is greater than the torque of mg about a point in contact with the ground. When the force F is applied the body may topple about A or it may translate. When the block topples about A, the normal force :-

  1. passes through centre of mass    
  2. is zero    
  3. shifts to the right and passes through rightmost edge containing A    
  4. is zero if the surface is smooth    

The correct answer is: shifts to the right and passes through rightmost edge containing A

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