Whats a KiloNewton?

[Andy Collins]

This discussion came up at work today, I couldnt remember off the top of my head, so got to thinking that maybe others may benefit from this too.

http://www.southeastclimbing.com/faq/faq_kilonewton.htm hope its useful!!

[Stumper]

1000 Newtons. Don't complicate things.

http://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Fig_newton2.jpg/180px-Fig_newton2.jpg

[silvafox]

Thanks BigA. That link has filled a void in my understanding of KN rating. Its critical stuff to know when deciding which block or pulley to use when rigging.

I don't think we need to get the calculator out but its essential to have a good idea what the gear can stand.

Don't forget your safety factor folks!

[Andy Collins]

To be honest, while we were talking about it, I was suddenly aware that I couldnt remember anything about it

[TreeSpyder]

i think a lil'easier yet is that it is 224.8 pounds of force; so you can feel better about rounding it to 225; or 2 1/4(2.25) x 100. Rather than the 224 given in the link.

 

So that 16kn is about equal to (32 + 4)x100; or 3600# of force. Rounding error is .2 x 16; or a meager 3.2# less than the 3600; for 3596.8 actual.

 

Also, mass and weight can be said to be the same on planet Earth, different elsewhere. Mass is the amount of matter:inertia(resistance to change in velocity); while weight is the amount of pull of gravity on a given planet.

[Steve Bullman]

welcome topper

[Topper]

Bon Daos steve :wave:

 

Big A i can bust this myth for you, a Kilonewton, in plain speak, occurs if a tethered 1 Kg weight is dropped 1 meter,

 

i.e. the force exerted as it decellerates almost instantainously is 1 Kn

 

It's my first post here so the beers are on me

 

The tab's behind the bar amigo's

[Aluk]

Hmmm, what happens if it is a real rope then, which for the sake of the user in the case of a safety rope, you would hope doesn't stop them instantaneously, if they should happen to be subject to an acceleration of around 9.81m/s just prior to the rope tightening?

 

NOTHING is instantaneous.

[Topper]

Hi Aluk, remember that climbing ropes are designed with a stretch factor to reduce shock loading.

 

A Kn would have been defined under lab conditions without this safety factor built in.

 

If you could read my post again you will see i said ' almost instantainiously' but i will take your word that NOTHING is instantainious

 

Every day is a school day

[Quickthorn]

The first link has everything you need. A Newton is a measure of force, and is, by definition, the force needed to accelerate a mass of 1 kg by 1 m / s 2.

 

Put another way, gravity on Earth gives you an acceleration of 9.81 m/s 2, so a mass of 1 kg on earth would need 9.81 N force to hold it in place.