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Output Force of Wheel Axle

  1. Nov 16, 2015 #1
    1. The problem statement, all variables and given/known data
    You apply a force of 17 N to a wheel with a radius of 0.75 m. If the axle has a radius of 6 cm, what is the output force, assuming the machine operates under ideal conditions?

    2. Relevant equations


    3. The attempt at a solution
    I don't even know how to begin to begin this. Help!
     
  2. jcsd
  3. Nov 16, 2015 #2
    Google "simple machines output force".
     
  4. Nov 16, 2015 #3
    Begin with thinking about all the equations you were given in class.
     
  5. Nov 17, 2015 #4

    TeethWhitener

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    What do you know about angular momentum?
     
  6. Nov 17, 2015 #5
    Angular Momentum= mass*velocity*radius
     
  7. Nov 17, 2015 #6
    I'm thinking it has something to do with Idea Mechanical Advantage which is output/input I believe.
     
  8. Nov 17, 2015 #7

    TeethWhitener

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    How about torque? (I probably should have said torque in my first post)
     
  9. Nov 17, 2015 #8
    We haven't learned that yet
     
  10. Nov 17, 2015 #9

    TeethWhitener

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    Hmm. Ok. It is about mechanical advantage. It's just a little easier to understand if you know about torque. No big deal. But gimme a sec to think about how to explain the problem without torque.
     
  11. Nov 17, 2015 #10

    TeethWhitener

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    Have you gone over concepts such as angular velocity yet?
     
  12. Nov 17, 2015 #11

    gneill

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    You can think of the setup like a lever, with each arm being a radius and the fulcrum being the shared center of rotation (axis). Surely you've covered simple machines like levers?

    Fig1.png
     
  13. Nov 17, 2015 #12
    In a really general sense. I understand it though.
     
  14. Nov 17, 2015 #13
    Sort of. Would output force be F2?
     
  15. Nov 17, 2015 #14

    gneill

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    Sure. For a lever, which end is "input" and which is "output" is your choice based on the situation at hand. Base your choice on the scenario presented in the problem statement.
     
  16. Nov 17, 2015 #15

    TeethWhitener

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    gneill's picture is probably much better help than anything I could put into words.
     
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