Coefficient of friction in soap?

AI Thread Summary
The discussion centers on the lack of available data regarding the static and dynamic friction coefficients for both dry and wet soap, with a commonly referenced kinetic value of 0.06. Participants express the need for experimental data and highlight that friction coefficients are typically specific to pairs of surfaces, such as soap on various materials. The variability in soap formulations, like Ivory versus Dial, is noted as a factor affecting friction characteristics. Additionally, the conversation touches on the distinction between viscosity and friction coefficients in oils, emphasizing that oils do not have defined coefficients of friction in the same way as solid materials. The thread concludes with a suggestion to refer to tribology handbooks for more detailed information on friction in different material combinations.
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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
 
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I would find it experimentally if you want good data.
 
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?
 
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.
 
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?
 
Oils have viscosity, not coefficients of friction.
 
cyrusabdollahi said:
Oils have viscosity, not coefficients of friction.
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.
 
Find a "Tribology" handbook and have a party.
 
Find "tribdog" and have a party

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

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