In the rope access industry everything is rated in kn of force. We can directly equate this to 100 kg when looking at working load limits on the slings in which we use to hang off of. Everyone always says you don’t need to know why, you just need to know that it does. I would like a simple way of explaining it to the new people coming into my industry.
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A kg is a measure of mass, a kN is a measure of force. To get force you multiply the mass by the acceleration of gravity (9.81 m/s*s). 9.81 is pretty close to 10, so they are simplifying it when they say 1kN.
I.e. 100 kg x 9.81 m/s*s = 981N or 0.981kN
9.81 is pretty close to 10, so they’re just rounding it up to 10.
100 kg x 10 m/s*s = 1000N or 1kN
In other words if you want the mass the rope is rated for, just take it’s force rating and divide by 10.
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