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Compound machine project.

  1. Feb 9, 2007 #1
    I have to make a compound machine that has an input force of 2N and an output force of 8N-10N.

    So far this is what I've got.
    Its a wheel and axle connected to a block and tackle.

    img130.imageshack.us/img130/4974/physicsbo6.png

    How much bigger will I have to make the wheel than the axle in order to get an output force at least 4x bigger?

    If it was a frictionless environment the wheel would have to be 2x bigger than the axle or more right? How much should I compensate for friction? I am using metal pulleys I bought that have bearings(or w/e they are called) in them but they do seem to have some friction. I can only get them to make about 3-4 revolutions before they stop.
     
  2. jcsd
  3. Feb 10, 2007 #2
    Oops, can you please move this to the homework forum?
     
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