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I'm interested in the maximum force which a human can apply to an object by pulling it with a rope (assuming a very good standing on the ground). A natural limit seems to be his weight but in the different situation of doing a pull-up, he is able to apply more force.

How could I get a an estimate for this?

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The maximum force which can be applied to a rope in a tug-o-war is equal to whichever of these three things is the smallest; the strength of the puller (it is not unusual for a strong person to be able to pull more more than his weight), his traction with the ground, and the resistance offered by the other side.

The winning side in a tug-o-war is actually the side with the most traction with the ground. The force on the rope is always equal for both sides, in accordance with Newton's third law.

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