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Coefficient of friction in soap?

  1. Sep 13, 2006 #1
    What are the static and dynamic friction values for dry and wet soap? I can't find these things anywhere on the net, except for an assumption of the kinetic value of 0.06.

    If someone has access to an extensive data sheet on frictional values, then that would help greatly. Thanx
  2. jcsd
  3. Sep 13, 2006 #2
    I would find it experimentally if you want good data.
  4. Sep 13, 2006 #3


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    Coefficients of friction are ordinarily listed for pairs of surfaces. For example, (from an oollldddd CRC Hndbk), "wood on wood (dry) x.xx, wood on wood (soapy) y.yy." Soap on 20 grit sandpaper, or soap on wet glass?
  5. Sep 13, 2006 #4


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    Keep in mind as well that there are myriad formulae of soap. Ivory bar soap will not have the same characteristics as Dial, and certainly not the same as Tide laundry detergent.
  6. Sep 14, 2006 #5
    Just out of curiosity,
    If we don't count in superfluids ,can somebody list friction coefficinents of pairs of hard and soft materials that are "the most slippery" in practice?
    Some sort of engine oils I guess?
  7. Sep 14, 2006 #6
    Oils have viscosity, not coefficients of friction.
  8. Sep 14, 2006 #7
    Directly,they haven't got it all right.
    But it can be defined under certain conditions where oil is present.
    Consider two metal pistons submerged in oil ,and they press against each other.
  9. Sep 14, 2006 #8


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    Find a "Tribology" handbook and have a party.
  10. Sep 14, 2006 #9


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    Find "tribdog" and have a party

    ...make sure not to bring any pepsi. :rofl:
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