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![[Post New]](/templates/default/images/icon_minipost_new.gif) 13 Feb 2007 13:17:44 IST
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Let F,fN and f denote the magnitudes of the contact force , normal force and the friction exerted by the one surface to another kept in contact.If none of these is zero,
(a)F>FN (b)F>f
(C)FN-f (d)FN-f<F<FN+f
I have the answer with me so please explain me the answer completely.
Is there anyone to explain me what is inertial and non inertial frame of referance??
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13 Feb 2007 13:25:25 IST
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i can't understand your (c) option
rest a,b,d are correct.
explanation
normal force and frictional force are always perpendicular.
let them be the sides of a rectangle.
now contact force is diagonal of this rectangle.
you can see that a,b and d easily follow
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