Frictional Force Homework: Answer B

[chawki]

Homework Statement

Ignore the second part on the attachment.

Homework Equations

The Attempt at a Solution

B because
Ff=coefficient of static friction*w
Ff=coefficient of static friction*m*g
Ff=0.30*85*9.8
Ff=249.9N

right?

 

[gneill]

Do you have doubts? What are they?

 

[chawki]

just making sure..because it was bit confusing when they mentioned the horizontal force and the kinetic friction.
will the crate still move when F is lower than Ff ?

 

[gneill]

The crate will not move until the net horizontal force exceeds the static friction force.

 

[chawki]

ok thank you :)