Why is it easier to lift a person when they are standing upright, as opposed to when they are lying on the floor, or lifting a dead weight?

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Like it’s easier if you hug their legs while they are standing up and hoist them up. I had a short friend who was able to do lift me when I was a kid, and could hold me in the air for at least a few seconds. How was this possible? Which muscles were important? Was it more about strength or technique?Is lifting someone heavier than you an impressive feat?

In: Physics

3 Answers

Anonymous 0 Comments

Very simply: the weight of a person (who’s alive and ideally awake) is more evenly distributed.

The reason for that is their body trying to balance itself on the point of contact where most of their weight lies. Your whole body is always actively working to keep you from falling over. The majority of its experience with that is while being upright (walking, standing, sitting in various positions).

Lifting an upright person while grabbing them anywhere from their hip downward and while their torso is upright is the most likely scenario where their weight will be most evenly distributed.

Why evenly distributed weight is easier to lift is another question. More weight being directly above your movement is a factor. Imagine trying to lift a gallon of water in a thin plastic bag. It’s variable form will make that harder.

All of this is very simplified, but should point you in the right-ish direction.

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