When someone tries to jump he/she can only jump for a height of few inch and doesnt break his leg which requires a small force but when someone falls from a small building he/she will have much higher impact force so basically why the person that falls (has higher impact force) doesnt break his leg, why someone can withstand so much force but cant even jump for a few inchs. For example lets assume a bodybuilder withstands 4000newton when he/she falls.
Answer
I think you are asking if we can fall, say, 10 feet and not break a leg, why can we not jump 10 feet. Our muscles are used for jumping, and our bones can normally, if in good health, withstand more pressure than our muscles can deliver, otherwise we could break a leg climbing stairs quickly.
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