A doubt about frictional forces

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Homework Help Overview

The discussion revolves around the concept of frictional forces, particularly focusing on static and kinetic friction, as well as rolling friction. Participants explore examples from a textbook, examining how friction behaves in different scenarios, such as a block on a surface, a crate on a truck, and a car on the road.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the direction of frictional forces in relation to relative motion, questioning how friction can act in the same direction as motion in certain cases, such as a crate on an accelerating truck. They also explore the mechanics of rolling friction and the conditions under which friction acts on tires.

Discussion Status

The discussion is active, with participants providing insights and clarifications on the nature of friction. Some have expressed understanding of specific examples, while others are still grappling with the nuances of friction in rolling scenarios. There is a mix of interpretations regarding the behavior of frictional forces in different contexts.

Contextual Notes

Participants reference a textbook for foundational concepts, and there are ongoing questions about the definitions and implications of static versus kinetic friction. The discussion includes considerations of relative motion and the conditions under which friction operates effectively.

  • #31
tiny-tim said:
Does that make sense now?

Yes it does now. So it is desirable to have driving tyres with high static frictional coefficient
and low rolling frictional coefficient.

I am currently reading "Engineering Mechanics - Statics, R.C. Hibbeler, 12th Edition"
and I think engineers probably understand these concepts better than the physicists.
For example, there treatment of topics like "Free body Diagram" is far better than physics
textbooks like Serway or Halliday & resnick... which is not surprising since for engineers
understanding mechanics is part of there bread and butter...
 

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