^Motion of a body on a fixed rough horizontal surface 

^Motion of a body on a fixed rough horizontal surface 

Suppose a block of mass ‘m’ placed on a rough horizontal plane is pulled by a horizontal force F.

Following are the various possibilities:

  1. If F = 0, then the frictional force acting on the block will be zero & the block will remain stationary.
  2. If F < fL, then the frictional force acting on the block will be equal to F & the block again will remain stationary.
  3. If F = fL, then the frictional force acting on the block will be equal to fL & the block will be at the verge of motion i.e. about to move.
  4. If F > fL, then the frictional force acting on the block will be equal to fK & the block will move with acceleration   a= f- fk /m   in the direction of force applied F.

 

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