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Ideal Mechanical Advantage of this bicycle?

  1. Nov 30, 2015 #1
    A bicycle wheel has a diameter of 73cm and is driven by a chain on a gear of 8.5cm diameter

    What is the ideal mechanical advantage?

    I know that IMA=de/dr
    But I'm not sure which one is de and which one is dr.
     
  2. jcsd
  3. Nov 30, 2015 #2

    billy_joule

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  4. Nov 30, 2015 #3
    Force input= 8.5 and force output=73?
     
  5. Nov 30, 2015 #4

    billy_joule

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    Those are distances, in cm, not forces.
    But your idea is right and will give the right answer.
    One way is to consider it as a 3rd class lever, the axle is the fulcrum, the effort is applied via the chain and the load is at the tyre contact point.
     
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