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Sourabh Kumar Grade: 12
        if the minimum force required to drag a heavy block is n times its own magnitude when the force is applied in an inclination of coefficient of friction with the horizon.find coefficient of friction.
8 years ago

Answers : (2)

pratham ashish
9 Points
										hi,


in the situation u mention in ur qn ,

f up nmg sin(a) tan(a)=mu (given in qn)

f down mg

f towards rt nmg cos(a)
f towards lft mu*mg(1-nsin(a)) {total dwnward f*mu}

if this is the min. then, f lft = f rt => mu*mg(1-nsin(a))= nmg cos(a)

=> mu = ncos(a)/{1-nsin(a)}



put sin(a)= mu/sqr root{1-mu^2}

& cos(a)= 1/sqr root{1-mu^2
then cross multiply u wud get

u^2{1+u^2}=n^2*{(1+u^2)}^2
=> u^2 =n^2* {1+u^2}
=> 1/n^2 = 1/u^2 +1
=> u = n/sqr root{1-n^2}.








8 years ago
Ramesh V
70 Points
										

I have solved the answer in one of your previous posts..plzz follow through this link:


http://askiitians.com/forums/Mechanics/10/3639/friction.htm

8 years ago
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