# Math Help - Frictional Force

1. ## Frictional Force

Hi
A quick question i have some of you canhelp me with, i have sort of worked it out just need to see what everyone else got?
Question:
The frictional force F newtons and load L are connected by the law F = aL = b. When F = 6.0 N, L = 7.5N and when F =2.7N, L = 2.0N

What do you come up with?
thanks in advance for any help

2. Originally Posted by JM92
Hi
A quick question i have some of you canhelp me with, i have sort of worked it out just need to see what everyone else got?
Question:
The frictional force F newtons and load L are connected by the law F = aL = b. When F = 6.0 N, L = 7.5N and when F =2.7N, L = 2.0N

What do you come up with?
thanks in advance for any help
Hi JM92,

I don't really see a question. Are you looking for the friction coefficient in each case?

I believe all you need to do is set up the formula:

$F=aL$

$6=a(7.5)$

$a=.8$

and solve for a.

Is that it?

3. Sorry seems it hasnt posted all the question, i need to calculate the value of A and B.

4. Originally Posted by JM92
Sorry seems it hasnt posted all the question, i need to calculate the value of A and B.
The way you've stated your formula 'F = b'. You already know F in each case. So, you also know b.

You said you 'sort of worked it out', so what did you come up with?

5. Dont know how right this is but heres what i done:

F=aL=b

Therefore F=b=2.7N

aL=2.7N

a=2.7N/2.0N

a=1.35

if F=6 and L=7.5

b=6N and
a = 6/7.5 = 0.8

If thats incorrent can any one help me to get the value of A and B?

6. F = aL = b
do you mean F = aL + b