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Calcs v Real World
Hambly’s Paradox…
A man weighing 600N sits on a three-legged stool. The stool is symmetrical, the man sits in the centre of the seat. What basic force should each leg be designed for?
The same man now sits on a square stool with four legs, one at each corner, the stool and the loading are symmetrical. What force should each leg of the stool be designed for?
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Holdfast Training Services Trial Blog 
Awesome link and so obvious when you think about. Also links very strongly into ensuring the input for a computer model accurately defines the model.
And that man in the picture definitely does not weigh 600N!!!
Haha, I remember being bamboozled by this as a first year a long time ago.
Do you think this is why legislation dictates that computer chairs must have 5 legs?
Andy, that Aussie BBQ diet has really had an effect on you.