Questions
A boy of mass m is sliding down a vertical pole by pressing it with a horizontal force f. If is the coefficient of friction between his palms and the pole, the acceleration with which he slides down will be
detailed solution
Correct option is D
Normal reaction R = f. Therefore, force of friction =μR=μf. The net downward force F=mg−μf. Hence, the acceleration a=Fm=mg−μfm=g−μfm. Hence the correct choice is (d).Talk to our academic expert!
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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
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