| . A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is (A) 20 N (B) 50 N (C) 100 N (D) 2 N | |
5 comments:
D) 2
Ya.The answer is 2.Can u tell what is your approach to that problem?
Normal reaction = force applied horizontally.
And the weight of the block acts downwards.
So, mg=μF...
mg=10 x 0.2=2
Ya.Normal reaction in horizontal direction.and weight is in vertical direction.Even i solved same like this .But i want little bit more clearance about this problem.If one force is acting downwords and another force is acting horizontal then resultant is between horizontal and vertical.How can you tell resultant is 0?
the block doesnt move implies net force is zero.. But i dnt knw how net force is zero.. If u could tel that..
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