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Math Help - Frictional Force

  1. #1
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    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
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by JM92 View Post
    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?
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  3. #3
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    Sorry seems it hasnt posted all the question, i need to calculate the value of A and B.
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  4. #4
    A riddle wrapped in an enigma
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    Quote Originally Posted by JM92 View Post
    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?
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  5. #5
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    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?
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  6. #6
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    F = aL = b
    do you mean F = aL + b
    http://books.google.com/books?id=1-f...age&q=&f=false

    read Q.6

    then you have 2 simultaneous equation.

    7.5a+1b=6
    2a+1b=7.5

    a=0.6
    b=1.5
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