Compound machine project.

  • Thread starter Towely
  • Start date
  • #1
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Main Question or Discussion Point

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[/URL]

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.
 
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Answers and Replies

  • #2
8
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Oops, can you please move this to the homework forum?
 

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