The discussion revolves around comparing the force required to pull a box along the floor with the force needed to lift the box onto a table, focusing on the concepts of friction and forces involved in both scenarios.
Participants are actively questioning the assumptions about the coefficient of friction, particularly regarding its possible values exceeding 1. Some have provided examples and references, while others express uncertainty about the implications of such values.
There is an ongoing discussion about the nature of the coefficient of friction, with some participants noting that it is unusual for values to exceed 1, yet acknowledging that certain materials may exhibit such characteristics.
The coefficient of friction can be greater than 1.lola2000 said:Homework Statement
A student measures the the force required topull a box along the floor and then the force required to lift the box onto a table. Which is greater?
Homework Equations
The Attempt at a Solution
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Is it the force to lift the box since frictional force is the normal force or weight times the coefficient of friction which is between 0 and 1?
Is there a reference saying that the coefficient of kinetic friction can be greater than 1?SammyS said:The coefficient of friction can be greater than 1.
It is highly unusual even for static friction.Chestermiller said:Is there a reference saying that the coefficient of kinetic friction can be greater than 1?
Chet
Thanks. Very interesting. I'll file this away in my brain.SammyS said:It is highly unusual even for static friction.
I have seen a few values listed with μk > 1 .
Al on Al showed 1.3 & 1.4 in a couple of tables.
Lead on steel in one or two tables -- I don't recall the value.
I don't why intrinsically that it's not possible for μk > 1 , but I don't have any good references.