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A block of mass 5kg is placed on a rough horizontal surface of a moving compartment .It is seen by an observer sitting inside the compartment ,that A force of 10N is res in horizontal direction to move the box in a direction parallel to the motion of compartment while a force of 20N is res in horizontal direction to move the box in opposite direction .Find the coefficient of friction bet the surface of the block and the surface.
If we draw fbd of block then there are 4 forces acting on it1)gravity (weight) 2)friction3)Normal reaction of ground4)psuedo force due to acclerating cartWeight of bolck=mg=50Normal reaction=50We know that psuedo force acts in the direction opposite to direction of motion of accelerating bodyThus, here psuedo force=20NThus 10=friction bet block and compartment10=uN10=u50u=0.2
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