Calculating Force P to Lift 200kg Crate: A Challenge!

[mike41]

Homework Statement

Determine the force P required to like the 200kg crate. Coeff. Static friciton is 0.3 on ALL contact of surfaces. Neglect Wedge Mass

Homework Equations

μS x Fn = Fk
Summation of forces eqns

The Attempt at a Solution

im getting more unknowns than equations
see attachment.

 

[Delphi51]

You should be able to get the friction force due to the B wedge moving on the crate surface quite easily. Do that first!
For the next surface down, can you find the normal force? Both the weight of the crate and the P force contribute to it.

 

[mike41]

haha ofund it actually. muFN = Fk so uu only have 2 variables. gah well thanks anyways