Why Does Inertia Affect Movement of Coin on Paper?

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Discussion Overview

The discussion revolves around the effects of inertia and friction on the movement of a coin resting on paper when the paper is pulled. Participants explore the concepts of static and kinetic friction, as well as the influence of the speed of pulling on the coin's movement.

Discussion Character

  • Conceptual clarification
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant observes that when pulling the paper quickly with a high force, the coin remains in place, while pulling slowly allows the coin to move with the paper.
  • Another participant suggests that the difference in behavior is due to the coefficient of static friction being higher than that of kinetic friction.
  • A later reply adds that the speed of pulling affects the time available for the coin to accelerate, indicating that faster pulls may not allow the coin to gain enough momentum.
  • Static and kinetic friction forces are defined, with static friction being capable of exceeding kinetic friction under certain conditions.

Areas of Agreement / Disagreement

Participants express differing views on the initial claim regarding the effects of force on movement, with some agreeing on the role of friction while others challenge the interpretation of the forces involved.

Contextual Notes

The discussion includes assumptions about the coefficients of friction and the conditions under which they apply, as well as the influence of the speed of pulling on the coin's response.

adjacent
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The Coin(Green) in lying on a paper which is lying on a box.When I pull the paper with a higher force so that I could remove it easily,the coins stays about the same place.
When I remove the paper slowly,the coin comes with the paper.
Why?

I think that objects can react(Move) to smaller forces easily but for larger forces,it doesn't.
What do you think?
 

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adjacent said:
Why?
Because the coefficient of static friction is higher than the coefficient of kinetic friction.

adjacent said:
I think that objects can react(Move) to smaller forces easily but for larger forces,it doesn't.
What do you think?
No, that is wrong.
 
DaleSpam said:
Because the coefficient of static friction is higher than the coefficient of kinetic friction.
What?I don't Understand
 
In addition to the difference between static and kinetic friction, there is the difference between fast and slow.

If you pull the paper with high force, you pull it fast. There is not much time for the coin to speed up. If you pull the paper with low force, you pull it slow. There is more time for the coin to speed up.

The momentum delivered by a fixed force over a time interval is proportional to the duration of that interval.
 
Static friction force is given by [itex]f_s\le\mu_s N[/itex] and kinetic friction force is given by [itex]f_k=\mu_k N[/itex]. In both cases N (the normal force) is the same, so ##f_s## (the friction force without slipping) can be larger than ##f_k## (the friction force with slipping).
 
Oh .Now I Understood.Thanks
 

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