Timeline for Why speed is defined as distance over time [duplicate]
Current License: CC BY-SA 4.0
13 events
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| Feb 25, 2019 at 14:45 | history | closed |
FGSUZ noah Kyle Kanos ZeroTheHero Jon Custer |
Duplicate of Why is speed defined like it is? | |
| Feb 24, 2019 at 12:02 | comment | added | alephzero | Concepts like "speed", "distance" and "time" mean something in the real world we live in. If you want to invent a new concept like "flurp" which equals distance $\times$ time, that's fine - except that in the real world there isn't any obvious use for "flurp", which is why it doesn't already have a name. | |
| Feb 24, 2019 at 11:45 | review | Close votes | |||
| Feb 25, 2019 at 14:45 | |||||
| Feb 24, 2019 at 11:42 | comment | added | anna v | since ancient times, before physics definitions, speed was a concept used in everyday life: how many days to go from Rome to Paris ?on foot? On horseback? Who can reach there first? Then came the concept of defining distance/time to easily know whether one gets there faster on foot or on horseback/, the one with the higher speed.. Physics took the definition over. | |
| Feb 24, 2019 at 11:15 | comment | added | Anuj | I agree that we can't add or subtract quantities which have different units but we can multiply them so why don't we define speed as distance times time | |
| Feb 24, 2019 at 11:13 | comment | added | PM 2Ring | OTOH, you can do stuff like $w=\ln\left(\frac{ct+x}{ct-x}\right)/2$, and that turns out to be more useful than speed when you get close to the speed of light. | |
| Feb 24, 2019 at 11:07 | comment | added | PM 2Ring | You can't just add quantities that have different units. What would the result even mean if you add a distance of $x$ metres to a time of $t$ seconds? | |
| Feb 24, 2019 at 11:07 | comment | added | Anuj | What properties do we want when we define speed? | |
| Feb 24, 2019 at 11:00 | review | First posts | |||
| Feb 24, 2019 at 12:14 | |||||
| Feb 24, 2019 at 10:58 | answer | added | noah | timeline score: 2 | |
| Feb 24, 2019 at 10:51 | history | edited | Anuj | CC BY-SA 4.0 |
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| Feb 24, 2019 at 10:49 | history | edited | noah | CC BY-SA 4.0 |
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| Feb 24, 2019 at 10:44 | history | asked | Anuj | CC BY-SA 4.0 |