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Steve Bullman

Rope testing question

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Maths and physics aren’t my strong point. What would testing to 25N tensile force mean in real terms and how could I replicate this test out of a facility?

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Basically it 25kN so 10 Newton to the kilogram,  wrap rope around a winch drum an get a weight of that mass, lift it, if it don't snap yr fine  . K

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2 minutes ago, Steve Bullman said:

So I need to suspend a 25kg weight basically 

You mean 25 Newton!   No you get 2.5 litre of water an that's 25 Newton's of mass  . K

Edited by Khriss
( are you testing garden string )

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Surely that can’t be right either?

 

My girlfriend is starting a little business selling baby teething products, she needs to get them tested and that’s the criteria 
 

yes it’s basically a piece of string 


 

 

13B23E71-A986-4834-90D5-20C3828A7A36.jpeg

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25N does seem low, I wonder if that is a maximum breaking load like we have with helmet chin straps or chainsaw lanyards ?

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4 hours ago, Khriss said:

You mean 25 Newton!   No you get 2.5 litre of water an that's 25 Newton's of mass  . K

 

4 hours ago, Steve Bullman said:

Surely that can’t be right either?

 

My girlfriend is starting a little business selling baby teething products, she needs to get them tested and that’s the criteria 
 

yes it’s basically a piece of string 

 

At average gravity on Earth (conventionally, g = 9.80665 m/s2), a kilogram mass exerts a force of about 9.8 newtons. An average-sized apple exerts about one newton of force, which we measure as the apple's weight.[4]

1 N = 0.10197 kg × 9.80665 m/s2    (0.10197 kg = 101.97 g)
So Khriss gave a good approximation (water is 1kg/litre)
these questions are fairly common - in Bing etc type in 25N = kg
will return25 newtons = 2.54929053 kilograms-force
so round the answer to 2.55 kg (approx 2litres plus 550ml water) if you want to go all sciency you can weigh the container and deduct one ml of water for each gram the bottle etc weighs
Edited by tree-fancier123
round not truncate

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