When carrying something heavy alone (a couch for example) it is either really heavy or seemingly impossible to lift, but when 2 people on each side lift, it suddenly becomes super light, and I think they have all the weight, making me feel guilty. I recently helped someone move and they said they thought the same. Where does all the weight go?
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The problem with lifting a couch is usually not the weight itself but the fact that the center of weight of a couch is usually far from your body. So it is going to tip you forwards making you lean far back and generally make it very hard to carry by yourself. Imagine for example being able to lift the couch up on your head keeping the center of mass right over your feet, it will be much easier to carry.
When two people carry a couch they can put their legs on each side of the center of mass therefore balance it perfectly between them. This makes it so much easier to carry as there is very little effort being put into balancing it and all the effort can be put into lifting it.
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