- #1

physicos

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## Homework Statement

A 3 kg block is on a plane inclined at 30.0° with respect to horizontal.Coefficient of static friction C

_{sf}between block and plane is 0.60.

What is normal force , and is the block moving ??

## Homework Equations

Using second low of Newton (vectors):

F

_{g}+f+N=ma.

So N=mg*Cos(30)

and we know that f=C

_{sf}*N = mg cos(30)* C

_{sf}

but considering the object not moving f= m*g*sin(30)

so the object must be moving

## The Attempt at a Solution

IS IT CORRECT ?