Help finding obscure coefficient of friction

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The discussion centers on finding the coefficient of static and kinetic friction for rubber on wood, specifically for a rough wood surface like a 2x4 and rubber similar to a hockey puck. Participants note that the friction values can vary significantly based on the smoothness of both materials. A user expresses difficulty locating a specific value or chart for these materials, indicating that a range would suffice for comparison in their experiment. A suggested resource is a link to a document that may provide relevant estimates. The conversation emphasizes the variability of friction coefficients based on material characteristics.
LESLEY

Homework Statement


I have a homework assignment that requires me to use the coefficient of static and kinetic friction for rubber on wood. I cannot locate this value anywhere so far.

Homework Equations


None.

The Attempt at a Solution


I have searched and searched and I cannot find the answer so far. Thanks for any input.
 
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How smooth is the wood? The number could vary dramatically depending on both the smoothness of the wood and the type and smoothness of the rubber.
 
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Charles Link said:
How smooth is the wood? The number could vary dramatically depending on both the smoothness of the wood and the type and smoothness of the rubber.
Thanks for your reply. I guess if there's a range out there somewhere I could go with that. It's not a value I'm required to calculate - he just wants us to use that number to compare with our experiment results. However I can't find a chart that has the coefficient of friction with those materials. The wood isn't polished - just like a 2x4 that came from home depot, and the rubber would be similar to a hockey puck.
 
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I found http://catalog.lib.kyushu-u.ac.jp/handle/2324/23785/p147.pdf
(Google search engine)
 
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haruspex said:
I found http://catalog.lib.kyushu-u.ac.jp/handle/2324/23785/p147.pdf
(Google search engine)
@LESLEY , it looks like Fig. 10 of this "link" from @haruspex may give you a good estimate.
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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