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Why rolling friction is small than sliding friction?

  1. Apr 6, 2015 #1
    Hello, members

    Why rolling friction is extremely small than sliding friction?
    Could somebody explain this to me by an example?

    Your help would be appreciated.

    Thanks a lot.
     
  2. jcsd
  3. Apr 6, 2015 #2

    rcgldr

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    Homework Helper

    I think you mean rolling resistance, which is related to deformation at the contact patch. During deformation and recovery as the surface of a rolling object travels through the contact patch, some of the energy is converted into heat and energy is lost. The result is a resistance to rolling that slows down the speed of a rolling object absent other forces. If the surface that an object rolls on is nearly frictionless, like ice, the rolling resistance isn't extremely small compared to the non rolling sliding friction force.
     
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