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Since the Imperius Curse is a mean of bending another persons mind to your will, and to force them to do what you want, it won't work on things. When the impostor Moody makes the students jump all around the classroom, over desks and stuff like that, it's not actually a question of making their bodies move like that, he's making their minds want to do that stuff. They're actually doing it themselves, just not by their free will. So, therefore, it doesn't work on things.

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