Why can't we lift objects while sitting?

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SUMMARY

The discussion centers on the physics of lifting objects while seated. When seated, the upward force applied to the chair is countered by an equal downward force exerted by the body, resulting in no net upward force. In contrast, when standing, the forces do not cancel out, allowing for the lifting of objects. This explanation highlights the fundamental principles of force balance and net force in physics.

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Hepic
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What happened about inside forces? For example If we are "out" of a chair,we can lift that,but If we are sitting we can not lift that.
I know that we can not "fly",so that is a reason,But I need physics reason.
Thanks!
 
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Because you are applying an upwards force on the chair but an equal downwards force on yourself and right back into the chair, cancelling out the upwards force. In comparison, when standing on the floor, you apply an upwards force on the chair, but a downwards force through yourself and to the floor! So the forces on the chair don't cancel and there is a net upward force, which raises it.
 
Thank you!
 

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