system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it easier for two people to lift twice the weight together, than half individually?
gpt
There are two different issues with lifting a heavy object: force and torque.  Often with a large box, apply a *force* equal to the weight of the box isn't hard, but applying a *torque* that will keep the entire box in your hands (instead of allowing the box to tumble away from you) is harder.  With one person applying a torque on each side, this issue disappears.