Timeline for Only external forces can accelerate the center of mass of a system- paradox
Current License: CC BY-SA 4.0
15 events
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| Sep 30, 2023 at 14:06 | vote | accept | Slater | ||
| Oct 5, 2023 at 16:12 | |||||
| Sep 29, 2023 at 19:28 | comment | added | Dale | @BobD thanks for the link, that is a good answer by BioPhysicist | |
| Sep 29, 2023 at 19:21 | comment | added | Bob D | @Farcher Check out BioPhysicist answer here which responds to the same Haliday and Resnick skater example. Like the block spring analogy. physics.stackexchange.com/questions/563889/… | |
| Sep 29, 2023 at 19:20 | comment | added | Bob D | Check out BioPhysicist answer here which responds to the same Haliday and Resnick skater example. Like the block spring analogy. physics.stackexchange.com/questions/563889/… | |
| Sep 29, 2023 at 19:00 | comment | added | Bob D | @Farcher doesn’t it also happen in the skater’s case? Just a different set of muscles | |
| Sep 29, 2023 at 16:42 | history | edited | Dale | CC BY-SA 4.0 |
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| Sep 29, 2023 at 16:36 | history | edited | Dale | CC BY-SA 4.0 |
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| Sep 29, 2023 at 16:30 | comment | added | Dale | @Farcher yes, I agree | |
| Sep 29, 2023 at 16:24 | comment | added | Farcher | Internal [chemical energy] energy is converted to kinetic energy. That can only happen in the jumpers case because the body is not rigid and different parts accelerate at differing rates. | |
| Sep 29, 2023 at 11:03 | comment | added | Dale | @Sirat That is too much for comments. Please ask those as actual questions instead | |
| Sep 29, 2023 at 7:36 | comment | added | Slater | 5. Are time and force the only factor or is there anything else at play in sometimes less, sometimes more force being imparted? Sorry for bombarding you with questions, but if you could please explain these 5 points. | |
| Sep 29, 2023 at 7:36 | comment | added | Slater | 3. In Skater and jumper case, impulse due to the forces- normal and gravity, considering all of this happens in less time, thus imparts more force – in jumpers case- it’s sufficient to overcome gravity with an acceleration, in skaters case possibly the static friction initially. (but force is not as much as collision/fission?) 4. Am I right in saying that all this happens in less time? But I guess time is more compared to a collision/ or a bomb internally breaking into fragments- hence less force is imparted to the jumper in comparison to what would possibly be imparted to fragments in bomb? | |
| Sep 29, 2023 at 7:35 | comment | added | Slater | Alright, so i get that the energy is conserved here. 1. Could you also elaborate on how does the normal transfer momentum in these cases? impulse. Does gravity create an impulse, possibly lowers the net impulse in the jumpers case but not in the skaters case? 2. To compare the amount of impulse imparted in these cases to let’s say fission of any particle/bomb? | |
| Sep 28, 2023 at 21:24 | history | edited | Dale | CC BY-SA 4.0 |
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| Sep 28, 2023 at 20:49 | history | answered | Dale | CC BY-SA 4.0 |