Kinetic friction vs static friction?

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SUMMARY

The discussion centers on the comparison between static and kinetic friction, emphasizing that static friction is typically greater than kinetic friction. Participants express skepticism about scenarios where kinetic friction could exceed static friction, with a focus on rubber's unique friction properties. The conversation highlights the relevance of friction coefficients in practical applications, such as drag racing, where optimal slip conditions can enhance performance. The terms "static" and "kinetic" friction are noted as less commonly used in industry contexts.

PREREQUISITES
  • Understanding of basic physics concepts related to friction
  • Familiarity with friction coefficients and their applications
  • Knowledge of materials, specifically rubber and its properties
  • Awareness of practical scenarios involving friction, such as drag racing
NEXT STEPS
  • Research the friction properties of rubber in various conditions
  • Explore the concept of slip in tire performance and its impact on friction
  • Investigate the coefficients of static and kinetic friction for different materials
  • Examine real-world applications of friction in automotive engineering
USEFUL FOR

Physics students, automotive engineers, material scientists, and anyone interested in the practical applications of friction in real-world scenarios.

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OK, so in my physics class we are doing friction. And the book states that static friction usually larger then kinetic.
Then he posed a question to whether or not there might be some crazy scenario where the kinetic friction is larger than the static friction?
Personally, I cannot think of anything.


I thought it would make for some interesting discussion and maybe some enlightenment.
Any other takes on this?
 
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I'm pretty sure rubber has some interesting friction properties...I'll look into it.
 
Yeah, I'd look into rubber. Have you ever seen plots for the forces created by a pneumatic tire? If you look at the longitudinal forces (think drag racing - acceleration in a straight line), then there is an optimal amount of "slip" where you will get the highest coefficient of friction. In the industry, they don't usually use the terms "static" vs. "kinetic" friction (only useful if you are trying to determine the slope of a hill where your car couldn't park because it would slide down, for example - not a realistic/useful problem to solve).

So I don't know if rubber has a larger coefficient of dynamic friction than static friction, but it does have some interesting friction properties and I wouldn't be surprised to hear that this is true...

-Kerry
 

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