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B Does the weight of a lever influences the amplification?

  1. Mar 8, 2017 #1
    According to Wikipedia:

    Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system. Ideally, the device preserves the input power and simply trades off forces against movement to obtain a desired amplification in the output force. The model for this is the law of the lever.

    My question is: does the material that the body of a lever is made of, or the weight of the body of the lever, influences the "force amplification" achieved, as long as it is a rigid material?

    Or only the ratio between the "arms" of the lever influences the "force amplification", regardless of the material that the body of the lever is made of, and of how much the body of the lever weighs?

    Sorry if this question sounds strange, I was just wondering how much would weigh the arm of a lever that is 30 meters long, if it was made of some ultralight rigid material based on carbon nanotubes...
  2. jcsd
  3. Mar 8, 2017 #2


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    Staff: Mentor

    The weigh of the lever will of course affect the mechanics, but it does not, strictly speaking, change the mechanical advantage. It is a separate effect.
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