Urban myths that somehow, people still believe

[TheLuke]

Cliftonite said:

blindswelledrat said:

Dixy said:

2 cars travelling at 50 mph in opposite directions crashing in to each other is like 1 car hitting a wall at 100 mph.

Why isn't it?

Walls tend to not have crumple zones.

But when you resolve the forces, they are the same? The same amount of energy is being transferred?

[Mammasaid]

TheLuke said:

Cliftonite said:

blindswelledrat said:

Dixy said:

2 cars travelling at 50 mph in opposite directions crashing in to each other is like 1 car hitting a wall at 100 mph.

Why isn't it?

Walls tend to not have crumple zones.

But when you resolve the forces, they are the same? The same amount of energy is being transferred?

But not equally (assuming both cars are similar size), In any case the energy has to be dissipated somehow. either through crumple zones or soft squidgy body parts....

[McVities]

Mammasaid said:

TheLuke said:

Cliftonite said:

blindswelledrat said:

Dixy said:

2 cars travelling at 50 mph in opposite directions crashing in to each other is like 1 car hitting a wall at 100 mph.

Why isn't it?

Walls tend to not have crumple zones.

But when you resolve the forces, they are the same? The same amount of energy is being transferred?

But not equally (assuming both cars are similar size), In any case the energy has to be dissipated somehow. either through crumple zones or soft squidgy body parts....

Not quite......two cars approaching each other at 50mph each have a closing speed of 100mph, but do not posess the same kinetic energy as one car travelling at 100mph.

Kinetic energy = 1/2 x mass x velocity (m/s) squared

Double the speed and the kinetic energy goes up by a factor of 4.

[mybrainhurts]

Mammasaid said:

SidJames said:

mybrainhurts said:

The M62 splits around a farm because the farmer wouldn't sell.

what's the real reason?

2 secs on google

http://www.dailymail.co.uk/news/article-3633580/My...

According to the chief civil engineer, that's not quite right. He said the land close to the farm was too unstable.

[TheLuke]

Mammasaid said:

TheLuke said:

Cliftonite said:

blindswelledrat said:

Dixy said:

2 cars travelling at 50 mph in opposite directions crashing in to each other is like 1 car hitting a wall at 100 mph.

Why isn't it?

Walls tend to not have crumple zones.

But when you resolve the forces, they are the same? The same amount of energy is being transferred?

But not equally (assuming both cars are similar size), In any case the energy has to be dissipated somehow. either through crumple zones or soft squidgy body parts....

Well,

Scenario 1 - Car at 100 into an immovable wall, the full energy of the car is transferred back to it.

Scenario 2 - Energy of car 1 to car 2, and vice a versa. So they each receive each others energy, therefore having half of the total energy compared to Scenario 1.


So Dixy was right, it is different. But there is obviously a st load of assumptions made in the above which wouldn't be possible in RL, such as immovable wall, perfectly distributed energy, no energy loss to sound and other means, blah blah blah.

Carry on as you were

[Wiccan of Darkness]

SidJames said:

mybrainhurts said:

The M62 splits around a farm because the farmer wouldn't sell.

what's the real reason?

I know the answer to this, it was both on a BBC4 documentary AND the same was told to me by a civil engineer. It's to do with the ground and the subsoil around the farm. It was really boggy and marshy and logistically the road engineers would have had to build a flyover. However, underlying rock formations meant the cheaper option was to split each side of the carriageway with the farm in the middle where there was sturdy bed rock and follow the underlying promontories around the outside of the farm.

Carriageway splitting is not uncommon. The M5 south of Bristol does it, although instead of a sideways split, the height difference is about 200ft.

[TheLuke]

McVities said:

Not quite......two cars approaching each other at 50mph each have a closing speed of 100mph, but do not posess the same kinetic energy as one car travelling at 100mph.

Kinetic energy = 1/2 x mass x velocity (m/s) squared

Double the speed and the kinetic energy goes up by a factor of 4.

Ofcourse, there is that aswell!

I'm rusty

[Dixy]

TheLuke said:

Mammasaid said:

TheLuke said:

Cliftonite said:

blindswelledrat said:

Dixy said:

2 cars travelling at 50 mph in opposite directions crashing in to each other is like 1 car hitting a wall at 100 mph.

Why isn't it?

Walls tend to not have crumple zones.

But when you resolve the forces, they are the same? The same amount of energy is being transferred?

But not equally (assuming both cars are similar size), In any case the energy has to be dissipated somehow. either through crumple zones or soft squidgy body parts....

Well,

Scenario 1 - Car at 100 into an immovable wall, the full energy of the car is transferred back to it.

Scenario 2 - Energy of car 1 to car 2, and vice a versa. So they each receive each others energy, therefore having half of the total energy compared to Scenario 1.


So Dixy was right, it is different. But there is obviously a st load of assumptions made in the above which wouldn't be possible in RL, such as immovable wall, perfectly distributed energy, no energy loss to sound and other means, blah blah blah.

Carry on as you were

https://www.youtube.com/watch?v=-W937NM11o8

[Granfondo]

Nanook said:

Drive Blind said:

Rangers were unjustifiably relegated to the bottom tier of scottish football.

I don't even think I've ever met a Rangers fan that believes that, never mind anyone else.

Rangers weren't relegated!
They were liquidated and reformed and allowed to enter the bottom division.

[droopsnoot]

Ari said:

Dr Doofenshmirtz said:

Chalk marks on your house means you're about to be burgled by the local diddycoys.

Even got released as a warning by one particularly dopey police force!

Currently being passed around FB by Greater Manchester Police.

Edited by droopsnoot on Thursday 22 June 19:07

[Mr Gearchange]

Chiropracty
Homeopathy
Acupuncture
Detox diets
Etc etc

Not urban myths as such - much worse.

[Cliftonite]

Along these ^^^^^ lines: fortune tellers and psychics!

[AH33]

"It's a limit, not a target"

[TheLuke]

droopsnoot said:

Ari said:

Dr Doofenshmirtz said:

Chalk marks on your house means you're about to be burgled by the local diddycoys.

Even got released as a warning by one particularly dopey police force!

Currently being passed around FB by Greater Manchester Police.

Edited by droopsnoot on Thursday 22 June 19:07

This doesn't even make any logical sense.

"I'll tell you what, lets not remember the address and take down some notes on it. lets make up some symbols that the house owner would recognise isnt normal and put it bang on the front of the house for other burglers to see, because we dont want all the houses to ourselves, we share"

Doesnt make sense. Utter tripe.

[4x4Tyke]

Pickled said:

Robbo 27 said:

In York, it is legal to kill a Scotsman with a bow and arrow apart from on Sundays.

Presumably this is an ancient law that has not been repealed.

I thought it was Chester and a Welshman?

Or Welshmen in Hereford.

The places change, the stupidity doesn't.

[FredClogs]

Bob Holness from blockbusters played the saxaphone solo in Baker Street... I know this is not true but I always repeat it when ever I get the chance.

[AlmostUseful]

Wiccan of Darkness said:

Carriageway splitting is not uncommon. The M5 south of Bristol does it, although instead of a sideways split, the height difference is about 200ft.

Common myth: the level difference is 200ft on the M5 between Clevedon and Portishead.
Truth: the level difference is a heck of a lot less than that.

[4x4Tyke]

The secret mobile phone game that 'trains' teenagers to undertake increasingly dangerous activities until they are instructed to do something that leads to their death in what appears to be suicide.

Edited by 4x4Tyke on Thursday 22 June 20:33

[Henners]

JagerT said:

Henners said:

Dixy said:

2 cars travelling at 50 mph in opposite directions crashing in to each other is like 1 car hitting a wall at 100 mph.

They'll never collide...

Are you a flat earther ?

Nope, just aware we're surrounded by water

[FredClogs]

mybrainhurts said:

Mammasaid said:

SidJames said:

mybrainhurts said:

The M62 splits around a farm because the farmer wouldn't sell.

what's the real reason?

2 secs on google

http://www.dailymail.co.uk/news/article-3633580/My...

According to the chief civil engineer, that's not quite right. He said the land close to the farm was too unstable.

They would have bought the land between the carriageways if the farmer had wanted to sell it, regardless of where the carriageways were placed, I reckon.