# Homework Help: Info hunt \ maximum frictional force

1. Mar 26, 2012

### Colin19

First of all I would like to clearify that I am in a programme that gives physics questions with littile previous learning and relies on individual determenation and efforts to deliver answers " Self learning " , " Info Hunt "
In the time most of you were learning science
I was busy learning English ,
I never studied physics in my life in Arabic nor in English
So please have patient and help me through my beginning
Hopefully that is answering a lot of assumptions
" Oh this guy is playing " " Get serious " ...etc

Question :
A body with mass 25 kg lying on a level floor has a steadily increasing horizontal force applied to it . If mu = 0.4
Calculate the maximum frictional force applied ?

Now I'm not asking for a quick answer like past attempts ,
I'm asking you to guide\help me understand\solve it my self
As I know no method or a clue of what to do ...

2. Mar 26, 2012

### SammyS

Staff Emeritus
What do you know about frictional force ?

3. Mar 26, 2012

### Staff: Mentor

Look up "static friction".

4. Mar 26, 2012

### Colin19

I know that friction is the force that is acting against motion
What I understood is, the term frictional force means basically the amount of resistance that the friction can demonstrate against a body's motion acted upon by an opposite force
to prevent it or slow it down .

5. Mar 26, 2012

### Colin19

My approch to solve now is :
to get the max friction I'll use this equation :
f = mu F
f : max friction
mu : coefficient of friction
F : Normal force
,
What I have in the Question
Is the mass 25kg and the mu 0.4 , and as it is laying on a level floor
I got g 9.81 m\s
,
So to apply the first equation I would need to find the normal force by this one:
N= m g
....
Gents am I going through the correct way ?

6. Mar 26, 2012

### Staff: Mentor

So far so good. You've got the normal force, so what's the maximal frictional force?

7. Mar 26, 2012

### Colin19

f = mu F
f = 0.4 x 245.25
f = 98.1 N
Maximum frictional force is 98.1 N
?

8. Mar 26, 2012

### Staff: Mentor

Looks good

9. Mar 27, 2012

### Colin19

Many thanks

Last edited: Mar 27, 2012