What Is the Maximum Value of Static Friction Coefficient to Move a 10kg Object?

[pyroknife]

Homework Statement

A force of 50N is required to start a 10kg object moving from rest. What is the maximum value that (Ms) could be?
A)5
b).05
c).5
d).1
Any help would be greatly appreciated thanks.

Homework Equations

The Attempt at a Solution

 

[Dick]

You'll have to start us out here. What's the normal force and what does the normal force have to do with static friction?

 

[pyroknife]

Normal force is the force acting up on the object so the higher the normal force the less kinetic friction it takes to get the object moving. I can't find the normal force though.

 

[Dick]

Exactly backwards. Frictional force is related to normal force times the Ms. So larger normal force means more friction. I think you might need to look in a book. How is the normal force related to weight? How is weight related to mass?

 

[pyroknife]

I was trying to use this equation Ff=FnMs, but there are 2 unknowns so i can't solve for it

 

[pyroknife]

I think the answer would be .5
Ff=FnMs
50=98Ms
Ms=.5(rounded)

 

[Dick]

You've got it. Fn=mg by balancing the vertical forces.

 

[pyroknife]

Thank you