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## Homework Statement

A body of weight [tex]W[/tex] rests on a rough inclined plane and a force [tex]P[/tex] acting at angle [itex]\alpha[/itex] with the inclined plane just prevents the body from sliding down . If the inclined plane makes an angle [itex]\phi[/itex] with the horizontal , prove that

[tex]P = W\frac{sin(\phi - \lambda)}{cos(\alpha + \lambda)} [/tex]

where [itex]\lambda[/itex] is the angle of friction.

## Homework Equations

[tex] F = \mu N [/tex]

## The Attempt at a Solution

I just don't know where to start . Any hints would be appreciated.