Timeline for How does pressure act evenly in all directions in interactions between solids?
Current License: CC BY-SA 4.0
9 events
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| Jan 14, 2022 at 16:50 | answer | added | nicoguaro | timeline score: 1 | |
| Dec 30, 2021 at 0:19 | comment | added | Juan | I have also been reading up on the triangular law of addition, which again makes a bit more sense of disqualifying things that appear to have direction as vectors. You can apply three directional forces to a (solid) object that all cancel each other out, stopping the object from moving, but that object would definitely still be feeling the associated pressure from those forces. Similarly, moving an object from A to B to C to A is definitely using energy/doing work, and current moving around a loop is still flow of charge (and electrically dangerous), even if the current goes from A to B to A. | |
| Dec 29, 2021 at 23:45 | comment | added | Juan | This link suggests that the types of situations I am thinking of (solid-solid interactions mainly) are more related to stress than to pressure. spark.iop.org/what-about-solids-pressure-and-stress This explanation makes more sense to me, but does that mean that pressure is not involved in solid-solid interactions at all? When high school science and physics books ask students to calculate the pressure from a book on a desk, are they wrong? Should they be asking to calculate stress? Is pressure not relevant here at all, or does it mean something else in these contexts? | |
| Dec 29, 2021 at 23:36 | comment | added | Juan | Thanks for that. I can see in a purely mathematical sense how pressure can be a scalar (since force is a vector and area can be too), but this still does not make sense to me intuitively. I am struggling to visualize how pressure does not have a directional element in the hammer and nail situation I described (or even something like putting a glass on a table). I can understand the force as what directs the nail towards the wall, and even the stress as the resistance to deformation (stress is not a scalar), but what exactly is pressure in this context? I can't see how it's not directional. | |
| Dec 29, 2021 at 22:53 | comment | added | BowlOfRed | Pressure is a scalar because it is a factor between (directional) force and (directional) area. physics.stackexchange.com/questions/18255/…. | |
| Dec 29, 2021 at 21:40 | comment | added | Juan | It is my understanding that pressure is a scalar because it acts uniformly in all directions. Is this not the case for solids? If so, would that suggest that there is a directional component to pressure? | |
| Dec 29, 2021 at 20:34 | comment | added | BowlOfRed | You seem to be assuming that pressure does act in all directions in or on a solid. Do you have a reference that claims this is true? | |
| S Dec 29, 2021 at 17:54 | review | First questions | |||
| Dec 29, 2021 at 19:47 | |||||
| S Dec 29, 2021 at 17:54 | history | asked | Juan | CC BY-SA 4.0 |