Originally Posted by

**Provoke** Don't bother, it has an infinity of solutions, he did something wrong, I'm trying to figure out what wait a sec...

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Ok, I'll trust you that you got F right. Say its 6.36N, the driving force that pushes the mop forwards is the x component of F:

6.36N x sin(31.33) = 3.3N

so the equation is:

6.36N x sin(teta) = sum of sheer forces (static and kinetic forces)

When the 2 equal each other you are static, the mop doesn't move.

It makes sense... the more you decrease teta...the more you decrease the x component of F thats your driving force so you need to push harder on the mop. When teta is zero you are pushing into the ground so even if you suply an infinite force you will not move the mop.

cheers,

Nuke