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RWDboy Forums Junkie Location: South Australia Registered: July 2002	Re: Physics problem. Sat, 26 March 2005 01:47 Quote: wo cars colliding at 50km/h each is just like one car colliding with the wall, also both going 50km/h so to make up for this in the one car/wall collision, where the wall is stationary, the car needs to be travelling at 100km/h to acheive the same "damage" I have NO idea what you are trying to say here, be more specific/clear. We don't seem to be on the same page. For starters - discussing the *speed* (not VELOCITY) at which the two cars approach each other isn't worth while. Velocity must have a DIRECTION, the rate at which the two cars approach each other is directionless! Please - ditch the numbers and the formulas - you aren't even explaining why they are important or what they have to do with the forces in the accident and who or what experiences those forces. It is ridiculously obvious that two cars both going 50km/h one travelling from the left and one travelling from the right, will approach each other at a rate of 100km/h. That is not under debate, what is under debate is that if you are inside one of the cars - which accident would appear worse. Like I said, you have to take into account your PERSPECTIVE on the issue. If you are looking at the collision from an outsiders perspective, the energy involved in the crash where one car comes from the left at 50km/h and another comes from the right at 50km/h is going to be twice as destructive as one car hitting a wall (wall stationary, car 50km/h). BUT If you are INSIDE one of the cars, and you are in the accident, the forces you experience either hitting a wall or another car coming at you are almost exactly the same (the fact that a car will crumple ever so slightly differently when smacking into concrete compared to smacking into metal should be taken into consideration). Also - please remember that the energy of the accident is related to the SQUARE of the velocity and is LINEARLY related to the mass of the object(s). Thus if you halve the mass of the objects in an accident (ie make it a one car accident), you will have to times the velocity of the object by the square root of 2 to come up with the same kinetic energy. (ie go 70.7km/h into a wall, instead of 50km/h). And the next person who says 'I wanted to consult my Year 12 physics book' or 'I passed year 11 physics' please be careful with you 'argument'. [Report message to a moderator]

	Subject	Poster	Date
	Physics problem.	Squid	Thu, 24 March 2005 03:43
	Re: Physics problem.	Corona RT142	Thu, 24 March 2005 03:46
	Re: Physics problem.	Squid	Thu, 24 March 2005 03:50
	Re: Physics problem.	Corona RT142	Thu, 24 March 2005 03:50
	Re: Physics problem.	Norbie	Thu, 24 March 2005 03:51
	Re: Physics problem.	Squid	Thu, 24 March 2005 03:58
	Re: Physics problem.	Indi	Thu, 24 March 2005 04:28
	Re: Physics problem.	STR8 2.8	Thu, 24 March 2005 04:32
	Re: Physics problem.	86DRFT	Thu, 24 March 2005 12:27
	Re: Physics problem.	Norbie	Fri, 25 March 2005 07:14
	Re: Physics problem.	Intensevil	Thu, 24 March 2005 04:25
	Re: Physics problem.	Corona RT142	Thu, 24 March 2005 04:31
	Re: Physics problem.	Squid	Thu, 24 March 2005 04:34
	Re: Physics problem.	Indi	Thu, 24 March 2005 04:42
	Re: Physics problem.	BlackMR2	Thu, 24 March 2005 04:32
	Re: Physics problem.	white86	Thu, 24 March 2005 04:44
	Re: Physics problem.	white86	Thu, 24 March 2005 04:51
	Re: Physics problem.	Mookie	Thu, 24 March 2005 04:58
	Re: Physics problem.	bbaacchhyy	Thu, 24 March 2005 05:08
	Re: Physics problem.	IRA11Y	Thu, 24 March 2005 05:39
	Re: Physics problem.	Dust	Thu, 24 March 2005 05:34
	Re: Physics problem.	Norbie	Thu, 24 March 2005 05:39
	Re: Physics problem.	skellator	Thu, 24 March 2005 05:57
	Re: Physics problem.	BlackMR2	Thu, 24 March 2005 05:58
	Re: Physics problem.	IRA11Y	Thu, 24 March 2005 06:04
	Re: Physics problem.	IRA11Y	Thu, 24 March 2005 06:07
	Re: Physics problem.	EnFlaMEd	Thu, 24 March 2005 06:33
	Re: Physics problem.	SPRINTAH!	Thu, 24 March 2005 06:30
	Re: Physics problem.	skellator	Thu, 24 March 2005 06:43
	Re: Physics problem.	SPRINTAH!	Thu, 24 March 2005 07:47
	Re: Physics problem.	IRA11Y	Thu, 24 March 2005 08:13
	Re: Physics problem.	skellator	Thu, 24 March 2005 08:57
	Re: Physics problem.	skellator	Thu, 24 March 2005 06:33
	Re: Physics problem.	RWDboy	Thu, 24 March 2005 06:42
	Re: Physics problem.	skellator	Thu, 24 March 2005 06:54
	Re: Physics problem.	RWDboy	Thu, 24 March 2005 06:49
	Re: Physics problem.	RWDboy	Thu, 24 March 2005 07:20
	Re: Physics problem.	skellator	Thu, 24 March 2005 07:44
	Re: Physics problem.	RWDboy	Thu, 24 March 2005 13:42
	Re: Physics problem.	CrUZsida	Thu, 24 March 2005 08:39
	Re: Physics problem.	CrUZsida	Thu, 24 March 2005 08:59
	Re: Physics problem.	NeiGH	Thu, 24 March 2005 09:51
	Re: Physics problem.	skellator	Thu, 24 March 2005 10:01
	Re: Physics problem.	Alex120	Fri, 25 March 2005 11:49
	Re: Physics problem.	86DRFT	Thu, 24 March 2005 12:22
	Re: Physics problem.	skellator	Fri, 25 March 2005 01:42
	Re: Physics problem.	RWDboy	Fri, 25 March 2005 08:16
	Re: Physics problem.	b1gb3n	Fri, 25 March 2005 02:37
	Re: Physics problem.	skellator	Fri, 25 March 2005 08:40
	Re: Physics problem.	RWDboy	Fri, 25 March 2005 09:10
	Re: Physics problem.	skellator	Fri, 25 March 2005 09:22
	Re: Physics problem.	gabe	Sat, 26 March 2005 00:46
	Re: Physics problem.	skellator	Sat, 26 March 2005 00:58
	Re: Physics problem.	RobertoX	Wed, 30 March 2005 05:40
	Re: Physics problem.	skellator	Wed, 30 March 2005 06:35
	Re: Physics problem.	RWDboy	Fri, 25 March 2005 10:42
	Re: Physics problem.	Alex120	Fri, 25 March 2005 11:45
	Re: Physics problem.	RWDboy	Fri, 25 March 2005 12:40
	Re: Physics problem.	skellator	Fri, 25 March 2005 22:50
	Re: Physics problem.	RWDboy	Sat, 26 March 2005 01:47
	Re: Physics problem.	skellator	Sat, 26 March 2005 02:16
	Re: Physics problem.	gabe	Sat, 26 March 2005 02:59
	Re: Physics problem.	RWDboy	Sat, 26 March 2005 01:53
	Re: Physics problem.	RWDboy	Sat, 26 March 2005 03:21
	Re: Physics problem.	IRA11Y	Sat, 26 March 2005 03:29
	Re: Physics problem.	Squid	Tue, 29 March 2005 03:48
	Re: Physics problem.	RWDboy	Sat, 26 March 2005 03:29
	Re: Physics problem.	RWDboy	Sat, 26 March 2005 03:33
	Re: Physics problem.	skellator	Sat, 26 March 2005 03:41
	Re: Physics problem.	RWDboy	Sat, 26 March 2005 04:13
	Re: Physics problem.	skellator	Sat, 26 March 2005 04:24
	Re: Physics problem.	RWDboy	Sat, 26 March 2005 04:47
	Re: Physics problem.	IRA11Y	Sat, 26 March 2005 05:04
	Re: Physics problem.	skellator	Sat, 26 March 2005 05:26
	Re: Physics problem.	skellator	Sat, 26 March 2005 06:06
	Re: Physics problem.	tom210	Sat, 26 March 2005 06:52
	Re: Physics problem.	skellator	Sat, 26 March 2005 06:56
	Re: Physics problem.	RWDboy	Sat, 26 March 2005 07:02
	Re: Physics problem.	skellator	Sat, 26 March 2005 07:05
	Re: Physics problem.	tom210	Sat, 26 March 2005 07:19
	Re: Physics problem.	jackel	Sat, 26 March 2005 07:23
	Re: Physics problem.	skellator	Sat, 26 March 2005 07:39
	Re: Physics problem.	tom210	Sat, 26 March 2005 07:28
	Re: Physics problem.	Norbie	Sat, 26 March 2005 09:47
	Re: Physics problem.	skellator	Sat, 26 March 2005 10:10
	Re: Physics problem.	Norbie	Sat, 26 March 2005 10:12
	Re: Physics problem.	skellator	Sat, 26 March 2005 10:21
	Re: Physics problem.	EldarO	Sat, 26 March 2005 11:37
	Re: Physics problem.	Norbie	Sun, 27 March 2005 02:02
	Re: Physics problem.	EldarO	Tue, 29 March 2005 16:41
	Re: Physics problem.	tom210	Sat, 26 March 2005 12:46
	Re: Physics problem.	RWDboy	Sat, 26 March 2005 12:53
	Re: Physics problem.	skellator	Sun, 27 March 2005 02:36
	Re: Physics problem.	RWDboy	Sun, 27 March 2005 03:15
	Re: Physics problem.	RWDboy	Tue, 29 March 2005 04:41
	Re: Physics problem.	skellator	Tue, 29 March 2005 05:50
	Re: Physics problem.	RWDboy	Tue, 29 March 2005 12:07
	Re: Physics problem.	skellator	Tue, 29 March 2005 21:05
	Re: Physics problem.	79rollaboy	Tue, 29 March 2005 21:20
	Re: Physics problem.	RobertoX	Wed, 30 March 2005 00:19
	Re: Physics problem.	RWDboy	Wed, 30 March 2005 00:42
	Re: Physics problem.	skellator	Wed, 30 March 2005 04:40
	Re: Physics problem.	RobertoX	Wed, 30 March 2005 04:49
	Re: Physics problem.	skellator	Wed, 30 March 2005 04:57
	Re: Physics problem.	RWDboy	Wed, 30 March 2005 13:47

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