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Everybody knows that you can't break an egg with our fingers when pushing from top and bottom.

I assume if we could squeeze hard enough the egg would break?

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Obviously yes. But if you want to know how much force you need, I suppose you just have to verify it experimentally, or at least know some experimental data about the hardness and shape of the egg. –  Bzazz Jan 21 '13 at 19:18
    
humm in my mind if the forces were equal they would just cancel each other out. –  Jamie Hutber Jan 22 '13 at 10:25
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They do, as long as the egg resists. Imagine pulling a spring by the extremities. The forces cancel out in the sens that the spring doesn't globally move in one or the other direction, but this doesn't mean it stretches. –  Bzazz Jan 22 '13 at 10:31
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