Timeline for Does a friction force act on a body on a flat surface with no external force?
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
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| Sep 29, 2019 at 12:31 | history | edited | Professor Sushing | CC BY-SA 4.0 |
added 63 characters in body
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| Sep 29, 2019 at 12:17 | comment | added | Bob D | Just a suggestion, but I would describe it as the microscopic movement associated with the interlocking of the adjacent surfaces thereby resisting macroscopic relative motion between them, or something along those lines | |
| Sep 29, 2019 at 12:09 | comment | added | Professor Sushing | Agreed. I will try to find time to clarify my answer. | |
| Sep 29, 2019 at 12:07 | comment | added | Bob D | That “movement” as you call it should not be confused with the macroscopic relative motion between surfaces that is normally associated with friction. That’s my only point. | |
| Sep 29, 2019 at 10:58 | comment | added | Professor Sushing | That's not true. When the external force is applied there is a minute movement between the two surfaces which adjusts the equilibrium between all the countless interactions. As the external force is increased the tiny movement increases until equilibrium can no longer be maintained, | |
| Sep 28, 2019 at 21:40 | comment | added | Bob D | "When the two surfaces are stationary with respect to each other, all of those individual interactions between atoms cancel each other out". You might want to consider revising this. This makes it sound like there is no friction if there is no relative motions between the surfaces. That would not be correct since you can have static friction that opposes an external force keeping the two surfaces stationary with respect to each other. The statement would be correct if you were referring to kinetic friction. | |
| Sep 28, 2019 at 19:37 | history | answered | Professor Sushing | CC BY-SA 4.0 |