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| Thread ID: 89795 | 2008-05-12 10:07:00 | Speeds and crashes | qazwsxokmijn (102) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 668599 | 2008-05-12 10:07:00 | A couple of physics question for all you physicists at PressF1: If a car doing 100kmph is rear-ended by a car doing 120kmph, would the damage be the same if the car was stationary, and rear-ended by a car doing 20kmph? And, in a head on collision involving 2 cars doing say 100kmph each, would the damage equal to a stationary car being hit by a car doing 200kmph? Thanks in advance! |
qazwsxokmijn (102) | ||
| 668600 | 2008-05-12 10:11:00 | Relative speed difference = 20 kmph, so yes. I would agree with the second statement as well. (As always, PF1 veterans may have something different to say to that) |
Renmoo (66) | ||
| 668601 | 2008-05-12 10:19:00 | Relative speed difference = 20 kmph, so yes. I would agree with the second statement as well. (As always, PF1 veterans may have something different to say to that) Yeah, that's what I thought as well, but I just want to confirm before adding it to knowledge base. |
qazwsxokmijn (102) | ||
| 668602 | 2008-05-12 10:19:00 | Given we have two cars doing 110 kmh in close proximity the chances of another accident are pretty good. (Especially if one has his 2 new tyres on the wrong end.) | R2x1 (4628) | ||
| 668603 | 2008-05-12 10:21:00 | It is a bit like the USA describing the docking of the space shuttle to the ISS where they say in hushed tones... "Think of the consequences if there is an error with both the craft travelling at 17,500MPH" Whereas, the speed difference is only around 1-2 or so MPH. The 17,500MPH is not relevant. The danger is what can happen if they bump at that speed (1-2MPH) as there is no repair shop 100metres down the road. Please tell me if I am wrong. I am not a physicist. (even though I can spell it) Ken |
kenj (9738) | ||
| 668604 | 2008-05-12 10:24:00 | And, in a head on collision involving 2 cars doing say 100kmph each, would the damage equal to a stationary car being hit by a car doing 200kmph? Thanks in advance! First one yes... Wrong on the second count. A stationary car is still going to move with the impact, dramatically lessening the force of the impact. Two cars meeting at 100kph a piece would be like a car hitting a thick concrete barrier at 200kph. Well maybe not a concrete barrier. But a more solid object than a stationary car. |
wratterus (105) | ||
| 668605 | 2008-05-12 10:25:00 | Err ? ? ? | R2x1 (4628) | ||
| 668606 | 2008-05-12 10:30:00 | Then again maybe the cars going 100 and 120 would encounter less damage seeing as a stationary car is harder to put into a state of motion than accelerating an already moving car (when it gets rear ended) Maybe.:punk :punk :punk :badpc: :drool |
pingu45 (13461) | ||
| 668607 | 2008-05-12 11:02:00 | Think of all those race car incidents where 1 car is slightly rear ended at speed and gets a small dent but being knocked off line proceeds to go sideways and roll end over end. That'd never happen to a parked car :) | PaulD (232) | ||
| 668608 | 2008-05-12 11:07:00 | Its because the parked car has no inertia of its own to multiply the impact of being hit by something else. | beeswax34 (63) | ||
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