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## Homework Statement

two objects are suspended on a platform one weighs 10 kg and the other weighs 20 kg, the coefficent of static friction is 0.4

## Homework Equations

how to find angle each of the objects start to slide

## The Attempt at a Solution

OK so Us=Fs/Fn

0.4= Fs/Fn

Fg=9.8(10) for the 10 kg object

using the vertical and horizontal components of the fg vector i get

Fn= ma cos(theta)

Fs= ma sin(theta)

U=fs/fn

0.4=sin(theta)

cos(theta) mass and acceleration cancel out

this is where i get stuck because i have theta over theta they should cancel out and i will be left with a broken equation :( any help would be appreciated.

Also if mass cancels out how am i supposed to get different angles for each of the boxes which weigh different amounts?