I am teaching impulse-momentum theory and want to use the real world example of a car crash, but I don't know how long it takes for a crash to happen. Any ideas?
2007-12-05 01:12:22 · 18 answers · asked by fangorn0 1 in Cars & Transportation ➔ Safety
seconds - half the time you dont realise whats happend until its over.
2007-12-05 01:14:39 · answer #1 · answered by Anonymous · 0⤊ 2⤋
Well It all depends...
Since you are teaching momentum-impulse just keep in mind that any colllision dependes on 2 simple factor, that is "mass" of the object and "velocity" at which the object is moving. This is the basis of collision theory as momentum=m*v. But you should get confused between momentum and impulse. They differ in the sense that impulse is the force that is created after or during the collision. This is what your question is all about "Time or the duration it took for a car crash". In order to find out the time it took for a crash. you need to know the "initial velocity and the final velocaity of the object along with the force of impact which can be found by using Newton's famous F=ma. To be prcise, you also need to add the resistance force of the tires and the road in the force equation. By boiling all these situation down you'll get something like this which will help you determine the time it takes for the car crash to occur.
F=mv-mu/t -------> F1+F2+.....=mv-mu/t
this also means t=mv-mu/F -----> t=1/F
as force increases time of collision decreses and vice versa.
Hope you get the point.
2007-12-05 01:32:55 · answer #2 · answered by alienx 1 · 0⤊ 0⤋
Depends on speed, condition of the road surface, the number of vehicles and obstacles involved.
A simple head on collision could be over in a fraction of a second. A high impact, NEARLY head on collision would cause a lot of spinning and may last several seconds. I have seen video of a rollover, at VERY high speed that lasted nearly ten seconds, from first contact until the vehicle came to rest. Multiple car crashes can go on for several minutes, as new vehicles come upon the scene, driven by drivers who are caught unaware.
2007-12-06 06:52:08 · answer #3 · answered by Vince M 7 · 0⤊ 0⤋
It takes just 1 second for a car to crash.
2007-12-05 12:17:02 · answer #4 · answered by Kenny G 3 · 0⤊ 0⤋
The crush time can be 80 to 300 milliseconds long (low speed, rear end impacts have a long crush time while high speed impacts have shorter crush times). The post-impact roll out can take a few seconds depending on the speed and distance traveled.
2007-12-05 01:18:38 · answer #5 · answered by remowlms 7 · 0⤊ 0⤋
Depends on when you think the crash has started and ended. Does it begin at impact? Or when the person pulls out in front of you and breaks start squealing?
1 second.
2007-12-05 01:17:41 · answer #6 · answered by Nympheas 2 · 0⤊ 0⤋
For the crash? As in... from impact to Velocity = 0?
It depends on the velocity and acceleration before the collision.
2007-12-05 01:15:37 · answer #7 · answered by Anonymous · 0⤊ 0⤋
what an odd question. most happen very fast. I've slid on ice towards another car so slowly i could have been walking past the car and still crashed into it.
2007-12-05 01:17:07 · answer #8 · answered by stewie g 1 · 0⤊ 0⤋
Yea, Linda has it right, my mom was in a car crash a few years ago and you don't even know what's going on until it's done.
2007-12-05 01:16:05 · answer #9 · answered by Renee 2 · 0⤊ 0⤋
I was able to avoid someone coming at me oncoming and i had about 1.5 seconds to react. but it was damn close. if there was a weather issue that affected traction, there would probably have been an accident. It was also evident that the other driver reacted as well, which helped. and all may be of no use to you at all.
2007-12-05 01:30:49 · answer #10 · answered by Latex 3 · 0⤊ 0⤋
to be honest it depends on what type of car it is and the conditions. if you mean while it's crashing its bout 2 mins but clearning up can take up to an hour.
2007-12-05 01:16:55 · answer #11 · answered by Anonymous · 0⤊ 0⤋