Q.
A boy of mass m is sliding down a vertical pole by pressing it with a horizontal force f. If μ is the coefficient of friction between his palms and the pole, the acceleration with which he slides down will be
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a
g
b
μfm
c
g+μfm
d
g−μfm
answer is D.
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Detailed Solution
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).
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