Limecat
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Registered: 25th Jun 05
Location: The Internet
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quote:
Originally posted by CorsAsh
quote:
Originally posted by Limecat
Walls move if you hit them...
Theoretically, in every impact there is moment of stillness as energy is passed from one subject to another.
To elaborate, if a train going at 100mph hits a person standing on the tracks, the person can not physically instantly achieve 100mph, and must accelerate from zero. Therefore, there is a miniscule moment when the train stops as it hits the person. It gets very messy, very quickly after that though 
Walls still move when you hit them.
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CorsAsh
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Registered: 19th Apr 02
Location: Munich
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Not disputing that, but the car will in fact stop momentarily during the impact.
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sand-eel
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Registered: 15th Mar 07
Location: carluke/braidwood--IRNBRULAND
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quote:
Originally posted by CorsAsh
quote:
Originally posted by Limecat
Walls move if you hit them...
Theoretically, in every impact there is moment of stillness as energy is passed from one subject to another.
To elaborate, if a train going at 100mph hits a person standing on the tracks, the person can not physically instantly achieve 100mph, and must accelerate from zero. Therefore, there is a miniscule moment when the train stops as it hits the person. It gets very messy, very quickly after that though
The person accelerates very fast, the train doesn't stop
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3CorsaMeal
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Registered: 11th Apr 02
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the corsa would take off
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sand-eel
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Registered: 15th Mar 07
Location: carluke/braidwood--IRNBRULAND
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How much is it worth though?
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Jambo
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Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
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quote:
Originally posted by sand-eel
How much is it worth though?
U2U John-d and if it's J-euro add £10k to the price
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Limecat
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Registered: 25th Jun 05
Location: The Internet
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quote:
Originally posted by CorsAsh
Not disputing that, but the car will in fact stop momentarily during the impact.
I don't agree.
On the basis that any obstruction put in the way 'theoretically' stops a car for a nano-second, what happens when you hit a fly on the motorway?
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sand-eel
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Registered: 15th Mar 07
Location: carluke/braidwood--IRNBRULAND
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ok a train going at 100mph that weighs 1000tons has 999045000 joules of kinetic energy lets say the person weighs 80kg and hits the at 100mph (obviously) so thats 79923.6 joules...
999045000 - 79923.6 = 998965076.4 joules, this will make about as much difference as nothing.
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John
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Registered: 30th Jun 03
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quote:
Originally posted by Limecat
quote:
Originally posted by CorsAsh
Not disputing that, but the car will in fact stop momentarily during the impact.
I don't agree.
On the basis that any obstruction put in the way 'theoretically' stops a car for a nano-second, what happens when you hit a fly on the motorway?
The fly still imparts a force on the car, it's just minuscule.
The car doesn't stop btw, just has the force of the fly pushing against it.
Also, a train isn't a car.
[Edited on 28-10-2010 by John]
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Limecat
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Registered: 25th Jun 05
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quote:
Originally posted by John
quote:
Originally posted by Limecat
quote:
Originally posted by CorsAsh
Not disputing that, but the car will in fact stop momentarily during the impact.
I don't agree.
On the basis that any obstruction put in the way 'theoretically' stops a car for a nano-second, what happens when you hit a fly on the motorway?
The fly still imparts a force on the car, it's just minuscule.
Do you jerk against your seatbelt because you 'theoretically' stopped? No. Exactly.
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DaveyLC
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Registered: 8th Oct 08
Location: Berkshire
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quote:
Originally posted by oceansoul
Head on.
Equivalent to hitting a wall at 100mph?
Yes or no?
Discuss.
No because a wall doesnt have crumple zones and a wall generally wont 're-bound'
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John
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Registered: 30th Jun 03
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Don't get your point. I'm not saying you stop, I specifically said you don't. The fly still has an effect against the car whether you understand that or not.
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Limecat
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Registered: 25th Jun 05
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quote:
Originally posted by John
Don't get your point. I'm not saying you stop, I specifically said you don't. The fly still has an effect against the car whether you understand that or not.
I know you didn't. My point is against that which you 'stop' when you hit something, you don't. Certainly not with a wall, been there and done it.
I would sooner hit a wall than another car head on at half the speed.
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DaveyLC
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Registered: 8th Oct 08
Location: Berkshire
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Our tiny human brains couldnt comprehend how infinitesimal the affect of the a fly on a car would be.. Its like pissing in the sea!
You dont stop when you hit something in a car, the car absorbs the impact thus you keep moving.. If you just 'stopped' you'd die! Your Aorta only needs to rotate by 5 degrees to kill you.
[Edited on 28-10-2010 by DaveyLC]
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John
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Registered: 30th Jun 03
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quote:
Originally posted by Limecat
quote:
Originally posted by John
Don't get your point. I'm not saying you stop, I specifically said you don't. The fly still has an effect against the car whether you understand that or not.
I know you didn't. My point is against that which you 'stop' when you hit something, you don't. Certainly not with a wall, been there and done it.
I would sooner hit a wall than another car head on at half the speed.
You don't get it either then, hitting a car at 50, driving straight at you, also at 50, is the same as hitting an immovable steel wall at 50. You would be better off hitting a car at half the speed, much better off.
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Limecat
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Registered: 25th Jun 05
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No-one said an immovable steel wall, just a wall. Walls move. How likely are you to drive into the Pentagon? Exactly...
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Dom
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Registered: 13th Sep 03
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quote:
Originally posted by Limecat
No-one said an immovable steel wall, just a wall. Walls move. How likely are you to drive into the Pentagon? Exactly...
Pentagon walls moved when a 757 slammed into it 
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Mike
Organiser: North West and North Wales
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Registered: 20th May 06
Location: nr. Skipton, North Yorkshire
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It can be argued in so many ways, different weights, crumple zones and all the rest of it and yes results would differ.
The way it's generally looked upon though is 2 identical cars hitting each other, with each doing 50mph, is the same as a car hitting an immovable object (as said earlier on walls will generally move, altering results) at 50mph.
The crash between the 2 cars would be considered by Police etc as a 100 mph collision, which is true, the combined speed at the time of impact is 100 mph but the damage is shared between the 2 cars so each car comes away with the damage that it would come away with if it was crashed into an immovable object at 50 mph.
Put simply, if we call the cars Car A and Car B, Car B is essentially an immovable object that Car A hits and vice versa. So in real terms, sticking exactly 100% to the theory, 2 cars hitting each other at 50 mph is the equivalent of 2 cars hitting an immovable object at 50 mph in terms of the total damage that would be caused in each collision.
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Kurt
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Registered: 23rd Oct 05
Location: Hi
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What if the two cars hit a fly in the middle? Or a moveable brick wall?
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John
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Registered: 30th Jun 03
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If they hit a brick wall even more of the energy is dissipated so the impact will be even less.
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Hammer
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Registered: 11th Feb 04
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What if the fly was actually Bart Simpson with a flies head?
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adiohead
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Registered: 28th Sep 01
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alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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quote:
Originally posted by CorsAsh
quote:
Originally posted by Limecat
Walls move if you hit them...
Theoretically, in every impact there is moment of stillness as energy is passed from one subject to another.
To elaborate, if a train going at 100mph hits a person standing on the tracks, the person can not physically instantly achieve 100mph, and must accelerate from zero. Therefore, there is a miniscule moment when the train stops as it hits the person. It gets very messy, very quickly after that though
If this was the case the G-forces involved would probably kill everyone on board the train. If a train is going 100mph and hits a person standing in the middle of the track it will not and can not stop just by that impact. And it's obvious the person must accelerate from zero - this is the 'speed' they are going just before the train hits them. You're over complicating it big time.
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3CorsaMeal
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Registered: 11th Apr 02
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been playing too much burnout 3 imo
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DaveyLC
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Registered: 8th Oct 08
Location: Berkshire
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quote:
Originally posted by Kurt
What if the two cars hit a fly in the middle? Or a moveable brick wall?
If there is a fly between the two cars the fly is struck at relative force of 5,000,000,000,000 joules which will turn the fly's tiny brain in to a small nuclear device resulting in both cars travelling forwards in time 5.34 nano seconds.
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