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Q Example 6 A block of mass 1 kg is pushed against a rough vertical...

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Q Example 6 A block of mass 1 kg is pushed against a rough vertical wall with a force of 20 N coefficient of static friction being 1 Another horizontal force of 10 N ts applied on the block in a direction parallel to the wall Will the block move If yes in which direction If no find the frictional force exerted by the wall on the block g 10 m s 4 Solution Normal reaction on the block from the wall will be N F 20 N Therefore limiting friction Weight of the block is fi UN l a 20 5 N W mg 1 10 10 N A horizontal force of 10 N is applied to the block The resultant of these two forces will be 10 2 N in the direction shown in figure Since this resultant is greater than the limiting friction The block will move in the direction of Fnet with acceleration Fnet fL 10 2 5 m 1 9 14 m s F 20 N 10 N Fig 5 125 Fnet 10v2 N A 45 Fig 5 126 10 N

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