How to Find the Friction Force on a Wedge

[SteelDirigibl]

Homework Statement

Homework Equations

F=mu*N

The Attempt at a Solution

The total normal force on the wedge is going to be the 210N plus 21kg*9.8*0.26 which is 263.508 Newtons to the right. Multiply that by 0.3 to get79.05N for the friction force up on the left side of the wedge.the normal force on the right side comes to 267.57 N, which has x component 263.508 and y component 45.8

For P you add the frictional force's y components plus the y component of the normal force on the right side? I can't seem to get the answer (I did by guessing, its 212N) but I don't know how to get there.

 

[tiny-tim]

Hi SteelDirigibl!

(have a mu: µ )

The total normal force on the wedge is going to be the 210N plus 21kg*9.8*0.26 which is 263.508 Newtons to the right*…

(I haven't tried this myself , but anyway …)

Have you taken into account the horizontal force on the right side of the wedge?

I think you need to start on that side, and work your way across …

the acceleration perpendicular to that slope is zero, so try starting with components along the slope.