If you lean back in your chair, at some point friction will fail, your chair will slip and gravity will pull you down to the floor. It will pull you down and pull you down fast!
If you lean over too far in your chair, gravity will drag you right off the seat and you will end up in a heap on the floor wondering what happened.
If you only put part of your chair upside down on the table at the end of the day, it will slip and accelerate until it meets the floor. <Crash!>
Chromebooks, notebooks and textbooks do not levitate - if not placed securely on a table or desk, gravity will do its thing.
Of course, we all know this, yet somehow, someone or something crashes to the floor in the science lab each and every day. Water spills, pencils end up under tables, Do Nows litter the floor, and glue sticks regularly roll across the lab benches and land the floor.
I have read that when astronauts return to Earth from long stays on the International Space Station, they expect they can "float" things next to them as they did in space. But, that doesn't work so well on Earth.
Gravity always wins.
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