As part of our ongoing drive to explore stupidity, we have been practising high fives while crossing each over on opposite tacks
We quickly came to the realisation that it can seriously hurt your hand and probably even more your head should anything go wrong at the last second
Now I was not surprise as I assumed that with a speed of approximately 30k in both directions, the impact would be approximately 60k which is a decent slap in anyone's book.
However, some smart friend of mine raised a very valid point on top of making me painfully aware of my own shortcomings:
If you imagine a fix wall and 2 cars coming at it from different directions at the same time, both impact would be equal to the initial speed carried by a sole vehicle, If you remove the wall, the same principal applies.
Can anyone confirm this theory???
Met a Euro on the wharf at Airlie a while ago who was a keen kiter,
After he told me that he lost a good friend in a kiting accident
he said I hope you dont Hi 5 other kiters,
then he explained he was Hi 5ing when he lost his edge and his board took out the other kiter.
I don't know if it is true or not,
but now I think of this every time a kite buddy sticks out there hand.
Pete
It is true as the maximum deceleration force is the same in both. Ie hitting the brick wall or another car coming at 100km/h you decelerate at the same speed.
in younger days in a car though i would give a mate a clip over his head as we were going past him only doing 20 ks tops . The end result was my arm got flung back to the door pillar and broke it in 3 places(my arm that is ) . The mate (which for some reason is still a mate) ended up being faced planted into gravell then a sort of head stand cart wheel with a very sore head and gravel rashed face .I would say dont do it cause and can bloody hurt or turn out real BAD . I could only imagine if a board or two shoulders came in contact with each what could happen .
Take two cars travelling toward each other at 30km/h, replace one of the cars with a brick wall that is (magically) doing the same speed.
So you've got a car travelling towards the wall at 30km/h, you've also got the wall travelling towards the car at 30km/h; this is the same as one car travelling towards a stationary wall at 60km/h.
Hence, two cars hitting each other head on, each doing 30km/h = the force of impact being applicable to an impact at 60km/h.
Putting a wall in between the two cars makes little difference to the force of impact.
The way they cancel each other out?
Take the two cars, place them back to back and tie them together with a strong enough cable, get the driver of each to accelerate at exactly the same pace at exactly the same time; the forward force generated by each car is equal, hence the forward forces of each car are equal and cancel each other out.
Result neither car moves. Providing the cable holds.
Well,well, conflicting views hey.
Well, I may have to check the mythbuster after work and will post my findings
High 5s suck dude
you never heard of the Wiggles
Fun for ya kids and saves you from gay bitch slappin 
Depends on the size of the wall
^what he said, there would be some energy loss in the wall but what's the point, depends on the details
Would you rather punch someone in the jaw who is standing still, or punch someone who is also trying to knock you out at the same time?
while he is standing still with his back turned and a drink in hand,only if he's bigger 
lmgtfy.com/?q=Mythbusters+Episode%3A+143+Mythssion+Control
It looks like you owe Beefarmer a Coopers green Sebol
From Mythbusters website:
"Two cars crashing into each other at 50 mph will result in the same damage (for each car) as a single car hitting a wall at 50 mph.
confirmed
In their small scale tests, the Mythbusters compressed clay at 1x and 2x speeds. Their results showed that two objects hitting each other at 1x speed will cause 1x damage. In their full scale tests, the Mythbusters crashed two cars into a wall at 50 and 100 mph as references. They then had two cars going at 50 mph collide into each other. After surveying the results, it was clear that the two cars suffered damage identical to the car that crashed into the wall at 50 mph. The Mythbusters explained that was possible through Newton's third law of motion. Although the total force was doubled by having two cars, that force also had to be divided between both cars during the crash."
Why not just take up rugby instead.
Then you can cuddle in real tight to each other's hairy butt, and no-one will think it odd or unmanly. 
Woo-Yeah!! High five?
Jeez, I guess this is one of the weird things. The initial spec "Compare a car smashing into a wall at 30km/h with two cars hitting each other at 30km/h" is pretty specific.
I can agree that the statement is probably right then, but only for this specific case. Each car absorbs a certain amount of force whereas the wall absorbs very little (so most of the force is absorbed by the sole car)
A better experiment would be:
Smash a 30km/h car into another stationary car.
Compare that to to smashing two cars at 30km/h
Think about it, would you rather crash into a parked car at 30km/h or hit another car head-on at 30km/h?
So oceanfire seems the force is still halved even if the speed is doubled. Ie; another car or a wall. Absolutely no difference.
nice to see my 1/2 carton of coopers fuelled saturday night rant turn into a healthy SB debate. also nice but somewhat suprising to see i was right
I think you should explore this a little further sebol. maybe handslap Elroy Jetson once more, then try the same with a solid object - let me know what hurts more :)
p.s. the first aid kit is well stocked, its in the rear drivers side compartment of my car, big green first aid sticker on it. help yourself if you need it. looking forward to more rants next weekend - sunday is shaping up to be pretty similar to that other day at you know where
pretty sure its the stopping distance (crumple zone) that matters.
2 cars hitting each other at 100kmh from opposite directions is the same as one car hitting an immovable wall at 100kmh. in the first scenario the combined speed of impact is 200kmh but the stopping distance is doubled.
so when you high five there is F all crumple zone anyway so i would say the impact is the combined force.
... and what about the guys who high 5 with a swing in their arm? Now I'm just complicating things!!!!!
Come on guys, when a moving object stops it is decelerating
(deceleration)* = (initial velocity) - (final velocity) / time taken*
now, if both objects have the same mass* then the final velocity shall be zero*
ie: 30km/h impact
*If the mass is different then apply newton's 2nd law (truck driver walks away uninjured)
*things that add time, crumple zone in car, foam in helmet etc...
*this is all very simplistic because a physicist will tell you that deceleration is not even a real word
yeah swear i saw something like this on mythbusters. a head on crash has less force than a car just hitting a solid rigid object. in theory you would think 2 cars at 100kmh had a head on the inpact would be like 200kmh
Guys, I reckon it's a pretty safe bet to take the word of the engineers I work with who state that the force of impact is doubled when two cars travelling at 30km/h collide head on, compared with one car travelling at 30km/h collides head on with a stationary wall, than what some of you kind of remember seeing on a TV show.
PFFFFFT- Engineers.....biggest waste of space going around- what would they know ?
Mythbusters proved it with plasticine and swingy things, that beats the hell out of all those theoretical equations and calculations that an engineer is scribbling on a bit of paper if you ask me.
