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Question

A block needs 50 N of force to move it  and you are applying 5 N of force on that block in the horizontal direction. So how much frictional force will the surface be applying on the block?


  1. 5 N

  2. 0 N

  3. 100 N

  4. 50 N


Solution

The correct option is A

5 N


The total force needed to move the block is 50 N but, when you are applying 5 N of force on the block to make it move, the ground will apply only that much force which is just sufficient to oppose the motion of the block i.e. 5 N. This is because static friction is a self-adjusting force.

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