Friction force

1. The problem statement, all variables and given/known data

A 3 kg block is on a plane inclined at 30.0° with respect to horizontal.Coefficient of static friction Csfbetween block and plane is 0.60.
What is normal force , and is the block moving ??

2. Relevant equations
Using second low of Newton (vectors):
Fg +f+N=ma.
So N=mg*Cos(30)
and we know that f=Csf *N = mg cos(30)* Csf
but considering the object not moving f= m*g*sin(30)
so the object must be moving
3. The attempt at a solution
IS IT CORRECT ?

http://ift.tt/1lue3KT

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