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| Thread ID: 108982 | 2010-04-19 07:25:00 | Quick question, Physics? | Metla (12) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 878089 | 2010-04-19 07:25:00 | 300kg mass, traveling at 100km/h, if it hit an object what would its weight register at? | Metla (12) | ||
| 878090 | 2010-04-19 07:34:00 | depends on the mass of the object its hitting doesnt it? 300x277.77m/s = 83331 (momentum = mass x velocity) i think its been a while since college:stare: |
GameJunkie (72) | ||
| 878091 | 2010-04-19 08:19:00 | Ah, you got only the first half, GameJunkie Metla is asking for impulse Impulse = Change in Momentum / time Let's say the object bounced off the target and resumes its motion at a 180 degree angle at a speed of 10km/h: Momentum towards = 83331 Momentum away = 8333.1 Change in momentum = 82497.9 kg m/s To determine impulse: Let's say it takes one second for the momentum to change its vector: Impulse = Change in momentum / time = (82497.9 kg m / s) / 1 s = 82497.9 kg m s^(-2) = 82497.9 Newton (www.daviddarling.info) = ....... (I'm stuck) |
Renmoo (66) | ||
| 878092 | 2010-04-19 08:24:00 | I'm what?:waughh: | Metla (12) | ||
| 878093 | 2010-04-19 08:24:00 | I thought Metla actually wanted the Kinetic energy. | Sweep (90) | ||
| 878094 | 2010-04-19 08:35:00 | Impact force. From what I can gather the attached pic is the formula, means nothing to me though. |
Metla (12) | ||
| 878095 | 2010-04-19 09:11:00 | Force = change in impulse divided by change in time. ([velocity final - velocity initial] over [time final - time initial]) So the force is what you're after. (Weight is not equal to mass.) Let's see... Assuming it stops, (360 - 0) / (tf - ti) {100km/h = 360 metres per second} We still need to know how quickly it stopped. |
pcuser42 (130) | ||
| 878096 | 2010-04-19 09:27:00 | Impact force. From what I can gather the attached pic is the formula, means nothing to me though. Looks more like a music score sheet |
gary67 (56) | ||
| 878097 | 2010-04-19 09:32:00 | Looks nothing like sheet music :lol: | pcuser42 (130) | ||
| 878098 | 2010-04-19 09:32:00 | F = ma where a = v/t The well-known Force equals Mass times Acceleration therefore Ft = mv re-ordering F = mv/t thus as t (time of impact) tends to 0 (zero) F tends to infinity, hence before you drop your precious iPhone onto the concrete pavement wrap it in a spongy cover to increase the time of impact away from zero and thus decrease the impact (F). |
zqwerty (97) | ||
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