Friction and the Coefficents of Friction question

[emilypanthel]

Homework Statement

so my question is; A horizontal force of 110 N (forward) is required to get a 35 kg box to start moving across a floor, Calculate the coefficient of static friction.
The equations i have been given are Ff=uFn
But I have just started this unit and am so confused. I don't even know where to start.

Homework Equations

The Attempt at a Solution

 

[tvavanasd]

First, draw a free body diagram for the box - include all forces.
It may help to list what you know and what need to find (organize the info outside of the question).

 

[jmb88korean]

Floor is horizantal so normal force equals gravitational force. To break frictional force, applied force must equal it.

 

[Sil]

1. Three blocks are tied to each other with
two pieces of string, one of which
passes over a frictionless pulley, as
shown. The coefficient of friction
between each block and the surface on
which it slides is 0.2. Just as the
system starts to move, the 3 kg and
6 kg blocks are each one metre away
from the pulley.

1.1Determine the tension in each of the strings.
1.2 How long before one of the blocks jams the pulley?