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Homework Help: [Very Easy] Factors, Divisors and Mechanical Advantage

  1. Oct 6, 2011 #1
    1. The problem statement, all variables and given/known data
    The mechanical advantage of a lever is 0.08; force is not amplified, it is simply diminished; distance, however, is increased:

    Work input = Work output
    F x d = F x d
    F x d = 0.8F x ?(d)

    This must be a really basic question, but I'm compelled to ask as I'm somewhat innumerate - what's 'd' multiplied or divided by for the equation to be true?
     
  2. jcsd
  3. Oct 6, 2011 #2

    NascentOxygen

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    Staff: Mentor

    d is multiplied by 1/0.8
    so that it cancels the 0.8 alongside the F
    to leave you with F x d as before

    which is the same as saying d is divided by 0.8, though, to me, not as clear.
     
  4. Oct 6, 2011 #3
    Really? Presume f = 2, d = 4:

    F x D = F x D
    2 x 4 = 0.8(2) + 1.25(4)
    8 = 1.6 + 5
    8 = 6.6

    ?
     
  5. Oct 6, 2011 #4

    NascentOxygen

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    Staff: Mentor

    Where did that addition operation spring from?
     
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