Frictional Force: Motion Direction Example?

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Discussion Overview

The discussion revolves around the behavior of frictional forces in relation to motion, specifically whether there are scenarios where friction acts in the direction of motion. Participants explore this concept through examples such as rolling motion of a tire.

Discussion Character

  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant asks if there is an example where friction acts in the direction of motion, suggesting a search for special cases.
  • Another participant argues that in rolling motion, friction opposes the tendency of the tire to slide backward, acting in the direction of the tire's translation motion.
  • Some participants challenge the idea that friction can be considered as acting in the direction of motion, stating that it opposes the motion of the tire and questioning the implications of this on tire acceleration.
  • There is a discussion about the nature of contact between the tire and the ground, with a participant noting that the point of contact does not move during contact, leading to the assertion that the work done by friction is zero if there is no sliding.

Areas of Agreement / Disagreement

Participants express differing views on the role of friction in relation to motion, particularly in rolling scenarios. There is no consensus on whether friction can act in the direction of motion, and the discussion remains unresolved.

Contextual Notes

Participants highlight assumptions regarding the motion of the tire, the nature of friction, and the conditions under which frictional forces operate, but these assumptions remain unexamined and unresolved.

oreo
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Is there an example in which friction acts in direction of motion. Any special case.
 
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In Rolling motion , If you have a tire , the frictional force would oppose the tendency of the tire to slide back , that means the frictional force will act to the opposite direction to slide motion and in the direction of the translation motion of the tire,,

Hope it is obvious ,,
 
But we can apply this to every case
Actually in this case also the frictional force is opposing motion of tire. If it is true then the tire should accelerate by itself.
 
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shayan haider said:
But we can apply this to every case
Actually in this case also the frictional force is opposing motion of tire. If it is true then the tire should accelerate by itself.

What do you mean by applying this case to every case ??

The frictional force here is opposing the tendency of the tire to slide back ward when it is moving forward not the translation motion of the tire itself ..,,
 
Maged Saeed said:
What do you mean by applying this case to every case ??

The frictional force here is not opposing the tendency of the tire to slide back ward when it is moving forward not the translation motion of the tire itself ..,,
It would oppose if the tire is stationary but it is in motion. If it is in direction of motion like you are saying then the tire should accelerate. Isn't it
 
Actually we say that the tire is touching the ground with one point , and ,this point is not moving during the contact time and we say that the work done by the frictional force is ZERO since it is not making any sliding to the tire , and that is IF the tire is not sliding .
 
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