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A block rests on a rough inclined plan...

A block rests on a rough inclined plane as shown in Fig. 7.93 . A horizontal force is applied to it . (a) Find out the force of reaction .
(b) Can the force of friction be zero ? If yes , when ? (c) Assuming that , friction is not zero , find it magnitude and the direction of its limiting value .

Text Solution

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(a) `N=mgcos theta+Fsintheta`
(b) Yes, if mg `sintheta=Fcostheta`
(c ) `f=muR=mu(mgcostheta+Fsintheta),` up the plane if the body has tendency to side down and down the plane if the body has tendency to move up.
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